CheeseHead BrownPants is the name of SpongeBob SquarePants when he lost his memory due to amnesia. The people in New Kelp City called him this when they met him. CheeseHead is the mayor of the city and only made one appearance, in the episode "What Ever Happened to SpongeBob?" He could not remember anything and anyone in Bikini Bottom when he returned. Spongebob has normal wear as he would in bikini bottom, but the only change is his hat.
He looks the same as normal SpongeBob but wears a black hat with a purple stripe on it. He is the mayor of New Kelp City.
In the German version of "What Ever Happened to SpongeBob?," his name is KäseGesicht BraunHose which means CheeseFace BrownPants.
Before he becomes mayor, he was called "Cheeseboy" by the citizens of New Kelp City.
In English slang, CheeseHead also means idiot. So, his name can be meaning of self-reproach.