| Unofficial name
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Not SpongeBob is a retired fry cook who briefly appears in a flashback in the episode "Truth or Square."
Not SpongeBob is a dark green fish with large light yellow eyes, a black beard, olive green lips, olive green limbs, and an orange dorsal fin. He wears a grease-stained apron, light blue pants, and a Krusty Krab employee hat.
He first appears when Squidward is reflecting on how happy his life was before SpongeBob moved in. He used to work at the Krusty Krab after Jim resigned, but before SpongeBob gained the position as a fry cook.
At some point before SpongeBob moved in, Not SpongeBob worked as a fry cook at the Krusty Krab. He worked there until he later retired, and then SpongeBob took his position as fry cook.
- It is unknown if "Not SpongeBob" is his real name, or if Squidward just remembers him that way to show that he is not SpongeBob.
- The idea of characters having the word "not" in the name was used later for the character Patrick Not-Star in "Hide and Then What Happens?"