Does frostbite get better over time?

Frostbite will. Either "get better" or the tissue will die. However the time frame for tissue to "declare itself" is longer thatn most think ( weeks not days) so early debridement or amputation for figer tips and toes is to bre avoided unless there is a surgicla need to treat infection. There are several grades of frostbite depending upon the severity of exposure. The more severe does worse. (see the image).