Booby, which comes not only from the gannet family of ungainly seabirds but from a Latin root meaning “to stammer” (and therefore presumed dull-witted), is used only by our trolls.

• 02.090 “You’re a booby,” said William.
• 02.091 “Booby yerself!” said Tom.

Harper, Douglas. “Booby”.  Online Etymology Dictionary.  Web.