Carl H. Greenblatt used to be a crew member for ‘‘SpongeBob SquarePants & ‘‘Billy and Mandy. He provided the voice of Carl in the episode "Selling Out" and Fred Fredburger for "The Grim Adventures of Billy and Mandy." He also appears several times in his own show, ‘‘Chowder, usually in a puppet form. He recently created his own Television show, Harvey Beaks.
Note: In Season One episodes, he was credited as Carl Greenblatt, not C.H Greenblatt.