Wellll......THIS is certainly going to be interesting :)

Other healing options based on Norse Mythology

Huldru-folk - The "hidden folk" are halfway in nature between trolls and landvaettir. They are peoples of the mound and forest, not slain by sunlight, but who often try to capture mortals by tricks and magic. They can be both helpful and harmful to humans. They are keepers of magical wisdom, generally related to the lore of plants and healing, though they also cause sickness at times.

Other mythologies
Unicorns
Phoenix
Dryads, but that's been taken

Just some options :) You wouldn't have to change TOO much, but there's options :P