Yes, Yes, and Yes.
I'd use cardboard about 18" high tacked right onto the rafter bottom to direct the air up higher.
Do you have gable vents? Good place for moist air to escape....in thru the eaves, out thru the gables.
Mild frostbite, even severe frostbite, doesn't need any treatment unless infection is present...
....IMO messing with compromised tissue is asking for trouble and could actually introduce infection.
Thanks aart. I will try to do that tomorrow it the snow storm allows. They're calling for 5-7" but temps up to 35. So maybe work in the snow? lol And yes I do have gable vents. Here they are. They face west(this orientation) and east. Eaves are north and south. Roosts are oriented at the back of the coop or the north side.