Miyashi I live up north of you in St. Ignace, haven't we had a tough spring!
If his feet have been frostbitten there is nothing to do other than continue keeping them clean. Frostbite damages the blood supply to the tissues, and any that has lost its blood simply will die. Affected areas will swell, and complete loss of the blood supply results in the tissue turning dark and stiff, then sloughing off (sounds like this may have happened to his toe).
This does not mean that the remaining parts of his feet will not heal. They will likely be swollen and tender for at least weeks if not months, and will be more susceptible to cold damage in the future.
Do you know how his feet became frostbitten? Was there an issue with the coop?
If his feet have been frostbitten there is nothing to do other than continue keeping them clean. Frostbite damages the blood supply to the tissues, and any that has lost its blood simply will die. Affected areas will swell, and complete loss of the blood supply results in the tissue turning dark and stiff, then sloughing off (sounds like this may have happened to his toe).
This does not mean that the remaining parts of his feet will not heal. They will likely be swollen and tender for at least weeks if not months, and will be more susceptible to cold damage in the future.
Do you know how his feet became frostbitten? Was there an issue with the coop?