SpongeBob RoundPants was the new name temporarily used by SpongeBob when he got himself new pants that were round. He showed them to Mr. Krabs, Patrick, Sandy, Squidward and many other people. SpongeBob thought that nobody recognized him with the round pants because of Patrick.
He has the same design as SpongeBob SquarePants, but has round pants that have the same design as his regular pants..
SpongeBob behaved like he was a new worker at the Krusty Krab, and asked for Squidward's help. Following Squidward, he started copying Squidward's actions, such as being rude to customers, throwing the trash out to the dumpster, sleeping in the bathroom or at the register, and even cooking patties like Squidward (burning them). He is gullible, much like his original identity's character.