Six, I believe.
Cave-trolls (Met in Moria)
Hill-trolls (These chopped Aragorn's grampa)
Stone-trolls (Bilbo's trolls? I don't know for sure, but I'm fairly certain I've heard them mentioned)
Mountain-trolls (Weilders of Grond)
Snow-Trolls (This one I had to look up, Helm Hammerhand was compared to one, we never actually meet one)
Olog-hai (Bred by Sauron)
? Did I miss any?
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The seasons fall like silver swords, the years rush ever onward; and soon I sail, to leave this world, these lands where I have wander'd. O Elbereth! O Queen who dwells beyond the Western Seas, spare me yet a little time 'ere white ships come for me!
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