This fleshy growth atop a chicken's head comes in shapes such as buttercup & pea
The "comb" most often 
refers to chickens in which the most common shape is the "single comb" of a ... 
such as the "buttercup comb" of the Sicilian Buttercup, "V combs" (popularly 
called "devil... [DOC] [TLE] What Is a Rooster Coxcomb?