napper’s poll, n. — Green’s Dictionary of Slang

napper’s poll n.

also knapper’s poll, napper’s noll

a sheep’s head, as food.

1703		in Hell Upon Earth.
1741		Canting Academy, or the Pedlar’s-French Dict. 116: A Sheep’s Head A Nappers Poll.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.