Trolls are a fictional sapient species seen in J.R.R. Tolkien's works.
Trolls were an artifical species of 15-foot-tall humanoid monsters created as minions by the Dark Lord Melkor from animated stone. Because of this origin, trolls are petrified by sunlight, though the Dark Lord Sauron created a more advanced breed, the Olok-Hai, who could withstand it. After Melkor's defeat, Trolls spread out throughout Middle-Earth, though many were progressively exterminated.