Trolls in D&D have always been problematic for me in their description. When I first saw a picture of one in the monster manual when I was a kid, I thought it was a zombie. I've always had the scandinavian depiction of Trolls firmly cemented in my head. Long nosed, big eared, hairy brutish creatures with a tail. Much of this was due being the grandson of Swedish immigrants and being immersed in in skandinavian folklore. Although a majority of the trolls that I was exposed to were the Jul Tomten (Christmas Elf), Tomtegubben (the dancing troll, also another name for Santa Claus) and Nisse (Gnomes). But the more malevolent Trolls I read about in various books like D'Aulaires Norse Myths and other books about Skandinavian folklore.
But the D&D version always seemed a bit strange to me, but after reading Poul Anderson's The Broken Sword I started to warm to the idea of green skinned hallow-eyed trolls.
Now Poul Anderson was the son of Danish immigrants so he's was no stranger to norse mythology.
And he himself set a lot of his fantasy stories in a norse background, Hrsolf Kraki, Mother Of Kings, The Last Viking series, and even some elements in Three Hearts And Three Lions.
Here's an excerpt from the book that gives a good description:
"They were not quite as tall as him, but night twice as broad, with arms like tree boughs that hung to there knees, bowed short legs and clawed splay feet. Their skin was green and cold and slippery, moving on their stone-hard flesh. Few of them had hair, and their great round heads, with the flat noses, huge fanged mouths, pointed ears and eyes set far into bone-ridged sockets, were like skulls. Those eyes lacked whites, were pits of blackness."
Not really the norse troll that I was used to from the norse stories of my childhood and also not exactly the troll of "Gygaxian Naturalism" . The trolls are shorter than humans and there is no mention of of limb regeneration or suseptibility to fire either. But after reading the complete story I can picture Thor doing battle with green skinned trolls.