It seems like there was a bit of a mix-up in your question regarding the anatomy of a chicken. If you are asking about specific features of a chicken's head, you're likely referring to the "comb" and "wattle."
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Comb: This is the fleshy crest on the top of a chicken's head. It can vary in size and shape depending on the breed of the chicken. The comb helps regulate body temperature and can also play a role in mating displays.
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Wattle: These are the hanging flaps of skin under the chicken's neck. Like the comb, the wattle is involved in thermoregulation and is also more pronounced in roosters than hens.
There are several different types of combs (such as single, rose, and pea) and wattles can also vary drastically in size and shape.
If you meant something else or have a different question, feel free to provide more details!