Cute Twonkie
Twonkies are a life-form from a comet Twonkus 3. They are small cute beings, but when they hear any musical patterns they evolved into Stompers then Gromps. When some twonkies aren't in freedom, or trapped, they turn into one big almost indestructible monster. They are parodies of the fictional species of Mogwai and Gremlins from the movie series Gremlins and Gremlins 2: The New Batch. They appear in the episode "Attack of the Twonkies" of The Adventures of Jimmy Neutron: Boy Genius.
Stomper, the first evolution
Gromp, the second evolution
Giant Twonkie, the final evolution