What is a roosters topknot called?

A roosters topknot is called a comb. Combs come in a variety of shapes and sizes, and can be used to distinguish different breeds of roosters. Some of the most common comb types include the single comb, which is a single, upright ridge of skin; the rose comb, which is a thick, fleshy comb that resembles a rose; and the pea comb, which is a short, rounded comb that resembles a pea.