The fleshy flap hanging beneath a domestic turkey's beak is called a wattle.
A turkey's wattle is a loose, fleshy area of skin on the throat or under the lower beak. Like other exposed skin structures on the head, it can change color and size according to arousal, temperature, and social display. Male turkeys often show especially vivid changes during courtship or competition.
The wattle is frequently confused with the snood. A snood is the fleshy appendage that extends from the forehead and lies over the beak. Turkeys also have caruncles, which are knobbly fleshy growths on the head and neck. These structures are all part of the turkey's distinctive head ornamentation, but they are not interchangeable names.
Domestic turkeys descend primarily from the wild turkey of North America. The adult male is commonly called a tom or gobbler, while the adult female is called a hen. Turkeys are raised mainly for meat, and the domestic bird is the same species as the wild turkey, Meleagris gallopavo.