I would think the body would heal when it gets warm or medical technology is advanced enough to allow some healing.
In: Biology
Water expands when it freezes. Your cells are primarily water. When they freeze they are destroyed… all of them. It’s all dead.
Healing a wound comes from new cells dividing to replace damage cells. In frostbite those calls are all destroyed.
If you don’t amputate it (with some exceptions) it will get infected. Ends of fingers/toes will often auto-amputate so if the damage is limited to those tissue it might be left alone to keep as much tissue as possible versus guessing where the finger will heal and maybe taking too much
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