Thanks, Cigala. The chickens sure seemed relieved today when there was actually some SUN, and temps not in the single digits. They were out and about (at least in their run) digging through their leaves all day. They looked so much less miserable and much livelier. I can't believe how absolutely brutal it has been this early in December. Hope the rest of the winter isn't as bitter- though the Farmer's Almanac doesn't leave me optimistic...
At any rate, I am definitely still looking for any pictures of post-frostbite infection.
Today I had the chance to really inspect the combs on my two Golden Comets, who are the worst off. They don't look great, but I don't smell anything foul or see anything pus-filled or oozing. They each have a couple of tips that have turned sort of off-white/yellow (this is after it turned black), so based on some other threads I've read, I am hopeful this is healing vs. infection. I did grab both of them and give them some Neosporin on the combs, hoping that will help if anything is "off" in the healing. When I felt the comb tips, they didn't feel stiff/hard (as if they were completely dead), so maybe there is still live tissue there that can be saved. It's so frustrating, because I don't think the frostbite is coming from coop problems overnight- there's just been so much moisture in the air, with such cold temps, they just can't seem to get relief, even when they're in covered areas.