This fleshy growth atop a chicken's head comes in shapes such as buttercup & pea
This 
fleshy growth atop a chicken's head comes in shapes such as... [DOC] [TLE] Comb (anatomy) - Wikipedia [PAR] A comb is a fleshy growth or crest on the top of the head of gallinaceous birds, 
such as turkeys, pheasants, and domestic chickens.