Trolls adapted for life among snow and ice. No snow-troll appears in Tolkien's work, but we can infer their existence from the fact that Helm Hammerhand is compared to one of these creatures during his sorties against the Dunlendings during the Long Winter.
This is based on the assumption that all trolls appeared at roughly the same time. We know that trolls in general seem to date back to the First Age or before, though it can't be stated with certainty that snow-trolls weren't a more recent development (a result of Sauron's breeding programmes, for example).
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