Fool ( Informal ) (7)
(Other definitions for muppet that I've seen before include "Jim Henson puppet" , "Soft - hearted TV character" , "Kermit or Miss Piggy, say" , "Kermit, Fozzie Bear or Animal?" , "Fool - Jim Henson creation" .)
(Other definitions for fathead that I've seen before include "Charlie" , "Slang idiot with enlarged cranium?" , "Stupid person" , "Dimwit" , "silly ass!" .)