The Trollshaws in J. R. R. Tolkien 's fictional Middle-earth are the upland woods, consisting at least partly of beech trees, that lay to the west of Rivendell between the Rivers Hoarwell and Loudwater . They were the haunt of trolls . Three of these trolls waylaid Bilbo and his companions during the Quest of Erebor . Years later Frodo and his companions found them on their way to Rivendell, but they were inert stone.
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