Chuckleheads

• Blockheads
• Numbers kept outside part of the UK, stupid folk
• Dumb bunnies
• Simple souls process number two, having spent a penny

Wiktionary Word definitions in Wiktionary
n. (ninny English)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ninny \Nin"ny\, n.; pl. Ninnies . [Cf. It. ninno, ninna, a baby, Sp. ni[~n]o, ni[~n]a, child, infant, It. ninna, ninna nanna, lullably, prob. fr. ni, na, as used in singing a child to sleep.] A fool; a simpleton. --Shak.