He is black in appearance and gray on the underside. Frank can be seen wearing a pale green suit, red tie, briefcase, and a small light brown hat in the episode, "You Don't Know Sponge" and blue swim trunks in the episode, "Ripped Pants."
In "Ripped Pants," he first appears emerging out of the sand, saying that the people who buried him in the sand forgot about him. He is then seen singing and playing the drums during the "Ripped Pants" song with SpongeBob.
He appears again in the episode, "You Don't Know Sponge," where he hears Patrick making whale sounds. Frank heard Patrick's whale sound and thought it was his ex-wife, Martha, calling until his friend assures him it is not.