The Coleonyx brevis was an amphibian native to Earth.
When Spock tried to match the sound of the Whale Probe to the sound of an Earth animal aboard the Klingon Bird-of-Prey HMS Bounty, a Coleonyx brevis was one of the animals shown. (Star Trek IV: The Voyage Home)
Coleonyx brevis is actually a Texas-banded gecko, although the images shown on the HMS
Bounty's display looks considerably different than a lizard.