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All answers having "Ninny" as clue:

3 Character Answers:

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ASS

OAF

SAP



4 Character Answers:

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BOOB

DITZ

DODO

DOLT

DOPE

FOOL

GOOF

PRAT

SIMP

TWIT

YOYO



5 Character Answers:

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DUNCE

GOOSE

IDIOT

SCHMO

TWERP



6 Character Answers:

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NITWIT



7 Character Answers:

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DINGBAT

FATHEAD

PINHEAD



8 Character Answers:

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IMBECILE



9 Character Answers:

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NUMBSKULL

SIMPLETON



10 Character Answers:

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SILLYGOOSE