That would the the ENT, the tree like creatures.
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The world of J.R.R. Tolkien in which his books The Hobbitand The Lord of the Rings are set is called Arda. Middle-earth is actually a continent in Arda, but the name has been used to refer to the whole fictional world. (IIRC, the world is not given a name in the actual Hobbit book itself, since Tolkien only integrated the Hobbit into his older Middle-earth world after he has already written it.)
Lord of the Rings in set in Middle-earth, a continent in the fictional world of Tolkien's stories.Peter Jackson's adaptation was filmed in New Zealand.
Trolls are much bigger than dwarves and hobbits, at least in Tolkien's world of Middle Earth. They are almost the equivalent of giants. They could pick up the hobbit with one hand.
J.R.R. Tolkien was the one who originally created orcs, yes. Although they also appeared in some of his other Middle Earth-related books, mainly The Hobbit, which is the prequel to The Lord of the Rings trilogy.
Sherlock Holmes is a fictional character of the late 19th and early 20th centuries who appeared in publication from 1887 until 1927.