muttonhead

He even called George Washington a “muttonhead” and “too illiterate, unlearned, unread, for his station and reputation.”

I am surrounded by nothing but suicidal muttonheads.

“Aye. I have squandered a third of my life trying to teach the rudiments of swordplay to churls, muttonheads, and knaves. Small good that will do me in those woods.”

Scarcely has the door closed behind him when Scirocco bursts out violently: "You are a muttonhead, Pistasch; the little banker is a hundred times cleverer than you."

"Could be more use than you think, muttonhead."