Huldra

Skogsra is one of Huldra's relatives, and shares certain physical traits.

Huldras are a species of forest-dwelling troll native to Scandinavia, with different names depending on region/subtype and the precise folklore they inhabit, with their list of alternate names including Skogsra, Tallamaja and Ulda.

They are perhaps best known for being one of the few Western examples of historical monstergirls; although the comparatively obscure huldrekall (the males of their species) are uniformly described as hideous, often with long goblin-style exaggerated noses, the huldras themselves are universally gorgeous. They do have some small traits that mark them as inhuman, although what these are depends a lot on the region you're looking at. Some stories give them a tail, either a cow's or a fox's. Others give them a back that is either covered in a carapace of bark or which opens up into a hollow, wood-lined interior, like staring into a hole in a rotten tree. And some give them both the bark/hollow back and a tail. Additionally, as trolls, they have tremendous strength and durability; handling red-hot metal straight from the forge or unbending horseshoes with their bare hands are common referenced feats.

They are known for being generally fond of humans, particularly charcoal burners, but vengeful if treated rudely, Also, in classic monstergirl fashion, they're very fond of handsome men and often seek to lure them into their embrace. Of course, because Europe can't let sexy nonhuman girls be their own thing, these stories have some dark twists; from simply keeping their new husband in the faerie kingdoms forever after to killing men who prove irritatingly inept lovers to, in the most common tale, becoming hideously ugly (but still super strong!) human women after accepting their newfound hubby's request for a good Christian marriage. Which is an incredible fucking waste, although it is a neat alternative explanation for/reskinning of hags.

Huldras are rather obscure outside of their native domains, but they do have a few /tg/ representations.

In Changeling: The Lost, the Winter Masques splatbook for first edition introduced the Skogsra and Thusser kiths, both of which take their names from alternate names for/relatives of the huldra. To say nothing of how the huldra is a perfect "basis" for a changeling's mien.

In Pathfinder, huldras are a type of fey endemic to cold forest & mountain regions. This version appears as a beautiful woman with a hollow-wood back and a fox's tail, and is a CR 4 threat whose most unique traits are her high Strength (19), her Manipulate Luck supernatural ability, and her Lashing Tail, a powerful tail slap attack that also makes its victims increasingly hideous, inflicting 1d4 Charisma damage on a hit.

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  Pathfinder's Huldra is unique for having both the hollow-wood back and a fox's tail.
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  Do you take this woman to be your bride? Think very carefully before making your decision.