Clam is a clam who lives in a fish tank in the Bubble Guppies' classroom. He is shown to have a very deep voice and can get the Guppies' attention when Mr. Grouper can't. Clam also has a cousin named Sam who he celebrates Clam Day with every year.
He is mostly gray. He has two small black eyes and a mouth.
Clam has appeared in several episodes of Bubble Guppies. His first appearance was in Call a Clambulance!.