Creature that goes "ribbit!"
I believe the answer is:
frog
'creature that goes ribbit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for frog that I've seen before include "throat problem" , "One of Ranidae" , "Long-legged amphibian" , "Grown-up tadpole" , "Tailless hopper" .)