Chomp

Chomps are large black boulder like enemies. They have two eyes, huge teeth, and make dog like sounds. In Super Mario Galaxy 2, they roll in a straight line unless they are following a track. Chomps can be especially annoying on skinny platforms because if they hit you, you will end up flying into space. Even if they dont send you flying into space, they will push you off the edge to your doom. Chomps can also be used to your advantage. You can lead them into large holes in the ground to unlock launch stars or hidden power stars. A galaxy called Chompworks Galaxy is based on chomps and using them to your advantage. There are many other types of chomps that have different characteristics.

Defeating Chomps
Chomps are hard enemies to dispatch. But they can be defeated by hitting them with a stretchy plant, using a bomb-omb, running into it with the rainbow star power up, or somehow make them collide. Other chomps such as the Silver Chomp and the Chomp Pup can be defeated in the same way. All normal chomps release a large amount of star bits when defeated.