I followed the recommendations from the Poultry DVM site below:
If tissue is still frozen rapidly rewarm in a warm (body temperature, 104-108 °F (40-42°C)) water bath.
I also utilized the site below; it states that less damage occurs to the tissues with rapid rewarming. Unless someone can provide a study where this is vastly different for chickens I consider this information pertinent.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3093920/
In most cases, the hands or feet will already have been thawed when you first see them. This is unfortunate because the supreme opportunity to favorably influence the outcome of frostbite is when the extremity is still frozen.
Until a few years ago it was thought that the frozen part should be re-warmed slowly by allowing it to warm at room temperature or even by rubbing it with snow, beating it, or immersing it in cold water. Such recommendations were passed from generation to generation and often taught by physicians to first-aid classes. Then in the mid-1950’s the brilliant studies of R. B. Lewis conclusively demonstrated the fallacy of this approach. He recommended rapid rewarming instead, and clinical studies have amply confirmed his finding that much less tissue is destroyed by rapid rewarming than by slow.
I follow directions from my vet
