The Unnamed Lizard-Like Species in Dragon Ball

If there was one unnamed race that sparked my interest, it was Freeza's race in Dragon Ball Z. Here are the known ones in the Anime:

Frieza

 

The self-proclaimed emperor of the universe, Frieza. He appeared after the Saiyan saga, revealing that he was running an organization that enslaved planets and sold them to the highest bidder. Despite his puny size, he was small but terrible. He frequently gave an appearance of weakness to deceive his opponents but showed how terrible he really was.  

Freeza revealed his first transformed state which was a giant version of himself. He was beaten by Piccolo but...

 

He revealed a second transformation in which he had an unusually shaped skull. This was pretty frightening.

   

Frieza revealed his third transformed state, which is said to be his true form. He was sleeker and back to his normal size. However, this form is no joke. This is where he gets really mean. Goku only met Frieza in this form. He was hit by the Spirit Bomb using Namek's energy but it didn't finish him off. When he killed Krilli -, Goku went Super Saiyan and batted him around.

 

In desperation, Frieza showed a fourth transformed state which was more powerful. He managed to tire the Super Saiyan Goku but with his injuries, he couldn't fight longer. It was in this form that he became a victim of his own skills. His slicer discs cut him into two. Begging Goku to kill him - he was however ignored. Goku shared some energy hoping Frieza will learn from his mistakes. Unfortunately, choosing death over life - he tried to kill Goku in hopes he would die among the strong.

King Cold and his minions found Frieza in space. For some reason, Freeza could survive extensive injuries even an explosion of a planet. He was rebuilt into a cyborg but Future Trunks made toothpicks out of him in an instant.

Later, Frieza both canonically (and non-canonically) achieved the fifth form in Golden Frieza. The form was introduced in the non-canon movie Dragon Ball Super: Resurrection of F and was later retconned with a few differences in the Anime. Frieza's number one problem is that he hasn't gotten used to this form. Powerful as it is - it' still pretty much too powerful to be contained even for Frieza. It seems Frieza's power is working against him in some way. 

King Cold

 

We are later introduced to Frieza's father King Cold. He is quite a bulky guy. Presumably stronger than Freeza. However, Future Trunks finished him off after finishing off his son Freeza.

Cooler

   

In the Dragon Ball Z non-canon movie Cooler's Revenge - we see Freeza's older brother Cooler. He is seen having Freeza's third transformed state (fourth form) but much taller. At first, Cooler manages to struggle against base form Goku. However, he reveals a what-if scenario if Frieza indeed had an older brother. The character kept going on within the movie continuity for a reason. Cooler appears to have more respect for his men than Frieza ever has. 

   

Cooler mentioned that he has learned one more transformation. The actual dub DOESN'T MENTION that he wanted to kill Frieza sooner or later. Rather, Cooler was more of the aloof big brother type in the original Anime. Cooler reveals that he's got one more transformation to go more than his brother. At first, it does beat Goku. However, Goku went Super Saiyan and nearly aced it. Cooler had one advantage - he could absorb energy faster than his brother. Goku managed to use a Kamehameha to send Cooler right INTO THE SUN. It was kind of funny to see Cooler attempt to destroy the sun only for it to destroy him. Though, Cooler managed to survive it for a second OVA. 

 

However, it wasn't the end of Cooler yet as he returns in Return of Cooler. Somehow his head made it into the Big Gete Star which rebuilt him into a metallic form. He launched copies of himself, each one as lethal under his mind. It was revealed he was inside the system, the brain of the Big Gete Star. He however was destroyed from within as his organic head was destroyed. Vegeta crushed the chip, making sure he wouldn't return. This form nearly made a joke out of the Super Saiyan forms and he didn't need to transform to get even. Though, it's revealed that the real Cooler was in the Big Gete Star controlling the Metal Coolers all along. Both Goku and Vegeta destroyed the core for good. 

In Super Dragon Ball Heroes non-canon web series - Cooler also becomes Golden Cooler in his ultimate transformed state. He does brag that what Frieza can do - he could also do. This again becomes another non-canon storyline like how Dragon Ball Z games are with the sidequests. Even the Metal Cooler form managed to go golden but had a problem of overloading. 

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Fans called them changelings and other names. Apparently, they dwell on a cold planet looking at their names Cold, Freeza, and Cooler. So far, they are known to survive massive injuries even if the body is separated from the head. In Cooler's case, he only had his head left and he survived which was worse than Freeza's being separated from his lower body. I would also like to think about the possible method of reproduction these guys have. Since Freeza mentioned of parents and not a single parent (as opposed to Piccolo's race which could be officially a hermaphrodite), they may have a female mate. 

Lizards are not hermaphrodite so we see the possibility of King Cold having a wife who was never seen, I assume her name must be Queen Chill, and bore two sons Coola and Freeza. Since they are reptilian, it's most likely these guys were born from eggs. Then again chameleons as reptiles have a live birth so perhaps, they were born of live birth than having to pass through being eggs. Nothing is known about their method of reproduction so I'll just assume that like most reptiles - they were born from eggs.