Could I use Bagbalm instead?
What if I brought the roos in to my house at night?Yes, you can but be aware that the amount of frostbite protection Vaseline or an oil provides against exposed chicken skin is very, very small in the end... Even in humans it's negligible protection against frostbite (some studies even suggest it increases frostbite risk as the oil can become super cooled or give you body a false sense of warmth) and most of that frostbite protection would be because it prevents your sweat from evaporating in the wind, since chickens don't sweat and should be in a draft free area that effect is gone... What it might do for chickens is simply help shed water and provide a barrier against bacteria...
What if I brought the roos in to my house at night?
I could keep the heat down?