In Middle-Earth the term Imp usually refers to a young, half-grown or juvenile Orc or Goblin. Not all orcs developed in the traditional manner, and some were more akin to wild beasts at birth, while others were grown from base earthen materials, but most orcs who came to breed in large numbers grew in this way. Imps (or Foshan, or Foshan-Hai) were sometimes confused with Snagas, lesser and smaller breeds of orc, and indeed were physically similar, but most orc-children were sheltered away from the rest of Orcish society and seldom made up a class of their own, as opposed to Snagas, which were a grown lower class of slaves. The term, particularly in the First Age, could also mean a lesser Demon or fallen Fay.

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