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Doesn't look like frostbite to me either. Given the dry cold it's unlikely to happen especially if you don't see condensation or other evidence of too much humidity inside the coop.

Assuming these are healthy, normal feathered teen or adult birds, they should handle the temperatures without issue. We have similar temps here, and I still have 4 out of 5 windows completely open, including one next to the roost. It's dry cold, but I want it to stay that way inside the coop...