I would think the body would heal when it gets warm or medical technology is advanced enough to allow some healing.
In: Biology
It’s sometimes the right thing to do, but many cases of frostbite have been made worse by inexperienced surgeons amputating too much and too early. A limb that looks that bad for other reasons absolutely does need amputation, but some dead looking tissue may recover with frostbite. Delay amputation where possible and seek the advice of a surgeon with actual frostbite expertise, not just your local vascular surgeon. More info here
http://christopherimray.co.uk/highaltitudemedicine/frostbite.htm
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