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Hmm... Good question!
I am personally of the opinion that Professor Morgy manufactured the Trolls out of the most easily available material in all of Middle-Earth: sand and clay.
Yes, I am suggesting that Trolls are cheap imitations of Dwarves who are really living, albeit being manufactured by Aule, the Chief Engineer of Valinor. Sunlight was probably overlooked by Morgoth when he decided to create some sturdy slaves out of cement. I don't suppose there was actually a Sun yet when Prof Morgy mass produced his trolls. (There were already orcs in Beleriand before the first rising of the Sun or Moon)
So, you see, my theories above fit in! Clothes that are made from Troll's hide would eventually solidify into stone... And if anyone climbs on top of a Troll which is just drying up...
Note to self: Never walk on a troll-leather carpet.
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'He wouldn't make above a mouthful,' said William, who had already had a fine supper, 'not when he was skinned and boned.'
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