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All answers having "Chowderhead" as clue:

3 Character Answers:

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ASS

LUG

RHO

SAP



4 Character Answers:

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BOOB

BOZO

CLOD

DODO

DOLT

DOPE

ENVY

FOOL

LUNK

SIMP



5 Character Answers:

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IDIOT

SCHMO

STUPE



6 Character Answers:

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DIMWIT

NITWIT



8 Character Answers:

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NUMSKULL



9 Character Answers:

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SIMPLETON