The Mastodonsaurus is a small amphibian (In-Game) from the Middle-Triassic period and was released into the game in the 5.6.0 update. The Mastodonsaurus is a weak but fast amphibian in the game and is green with an orange underbelly.
On real life, the mastodonsaurus was a medium sized 3-4 meters long temnospondyl amphibian,that lived like a crocodile,and attacked prey that got next to water.It could not stay out of water for too long due to it's skin and would die if it stood out of water too much.
It is usually called the Frog, but is sometimes called the Frog, Newt, and Kek.
Weirdly,even though a mastodonsaurus in real life would die on land after a certain amount of time,the ingame mastodonsaurus doesn't have moistness
It's the second amphibian added to the game,with the first one being koolasuchus.
Mastodonsaurus was a abnormally large temnospondylian amphibian which lived in the Triassic period.