Yup. Similarly to geese, they can be aggressive, territorial and complete bastards. At least if they don't associate you with being their owner/foodgiver. And both Dala and WanderingEng are right: turkeys don't fly but use wings while jumping, kinda like chickens but are capable of flailing for a greater distance. Dunno if it gives them any thrust or if that's just for show. Also, they can move with astounding speed when threatened. And it doesn't take much for turkeys and geese to get triggered.
Source: don't leave the "I'm gonna poke it" kind of six-year-olds on a farm.