What about Trolls?
I suppose there must be someone, somewhere, that possesses the knowledge, the personal experience, has the spinal fortiturd to shoulder the audacity of claiming such a vast amount of knowledge of so secretive a creature, knowing in advance the looks askance that such forbidden knowledge will surely bring along with the ancillary pointing of fingers and other philangial malignery. I mean, there's gotta be at least one of those here.
Don't you think?