Only time will tell how much of those tips he will lose. The white parts are slightly damaged, but the black parts will most likely fall off. Keep applying some sort of ointment to the comb. If you don't have bagbalm, you can use neosprorin, (without the pain killer...toxic to birds) Plain neosporin will help with infection and to heal skin. But bagbalm is the best stuff to use. I really heals skin fast.
Welcome to BYC! Please make yourself at home and we are here to help.
Sorry for your bird!
Keep the injured area clean. I recommend Vetericyn VF Hydrogel spray 2-3 times per day until healed. Alternatively, a triple antibiotic ointment or aloe vera can be applied to the damaged tissue.
Monitor the for infection, signs of which may include: swelling, redness, oozing, foul smelling discharge, etc. E
xpect it to take months for the full extent of frostbite to be realized and for recovery to occur.
Move a frostbitten chicken to a warmer location upon discovery of a severe case of exposure where the tissue is black or large areas of tissue are affected to stop any further cold injury from progressing.
Gradually warm the affected areas. Washcloths soaked in lukewarm water can be held very gingerly against them. Avoid rubbing or any friction that could cause additional damage to tissues.
You should keep him inside until his wounds are pretty much all cleared up. If he gets pecked or it happens again then you just have to repeat the whole process over again. Better to do it right the first time then have to do it numerous times.