Chain Chomp (unchained)
Chomp Heads are chainless Chain Chomps found in Super Mario World 2: Yoshi's Island and its remake, Super Mario World: Super Mario Advance 2. They only appear in the beggining of World 1-2 and are much bigger than normal Chain Chomps, setting the standard for their huge sizes. They jump from the background hills and destroy the ground that they land on. They seem to be unlimited in number in the background hill or they come back to the same hill after jumping. They only appear in certain levels, when a sign with one of them on it appears.
Chomp Heads are also a enemy in Super Mario Galaxy and roll straight off the planetoid, just like Piranha Heads. They are unaware of their surroundings but if Mario is to step in front of the Chomp Head, he will surely be knocked over and hurt.