I’m sorry this happened to your chickens. The experts here will usually say do not touch it and do not apply Vaseline for cold weather. Just let the combs heal on their own as touching or applying anything will be very painful. I have never tried Vaseline myself, though so I can’t speak from experience if that is a bad idea for cold weather…Having ventilation in the coop up high above their heads and eliminating moisture is the key to preventing frost bite.
That being said, those are some big combs to try to protect and I understand the bitter Wyoming cold. I myself am from Wyoming and it was an awful past week, I feel your pain. I often also wonder no matter how much ventilation, will a chicken with exposed parts in that much cold get frostbite anyways?
I am skeptical our coop has enough ventilation in all the right places, although we modified it this summer. But knowing that our coop was lacking, I went ahead and provided heat for them using a radiant heater this past week to help them through this cold snap and it was a huge relief for me to know they were at least somewhat warm. I know a lot of people on here are against providing supplemental heat, and I’m sure they really don’t need it most of the time. Just wanted to share how we coped, coming from a fellow Wyoming-ite