When I last did a Wilderness First Aid course, they emphasized this point really strongly re frostbite treatment:
Do not allow your doctor to do anything until he/she can prove to you that they have contacted the Vancouver General Hospital burn unit for the latest frostbite protocol.
This was definetely more in reference to blackened toes and the like, and this was a few years ago, and maybe VGH is no longer the be-all end-all in frostbite treatment, but it might be helpful, if you are talking to a doc about it, or if anyone does get serious frostbite.