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He is a light brown colored fish with a light tan-striped dorsal fin. He has orangish-brown lips and wears a red shirt. In "Chum Bucket Supreme" when he is approaching the register at the Chum Bucket, his shirt is red. At the next shot, the shirt is blue, and in "Free Samples," when he says "Did he said it was good?" his shirt is pink.
During the episode, "Yours, Mine and Mine," he was going to buy the new kids meal for just two dollars only to get Mr. Krabs to double it.
In "Kracked Krabs," there was a video showing Frank being ripped off by getting charged three times for a bag of chips with triple flavor.
In "Once Bitten," despite that he was bitten, he somehow managed to survive the infection (or thinking that he was infected) therefore he never became a zombie. He was able to stand upright as well. He is seen in the mob of survivors that are using the Krusty Krab as a safe zone.
In "Gullible Pants," he walked into the Krusty Krab, and SpongeBob went up to him, stating that he knew his secret. Not wanting his secret to be revealed, as his words to SpongeBob were "What! Who told you?!" he follows SpongeBob to the kitchen and begins to grill the patties.
This episode also reveals that Frank has a big secret.