Orc origin!

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Melkor captured elves and turned them into Orcs.

That all those of the Quendi who came into the hands of Melkor, ere Utumno was broken, were put there in prison, and by slow arts of cruelty were corrupted and enslaved; and thus Melkor breed he hideous race of the Orcs in envy and mockery of the Elves. Silmarillion

Much is the same with Trolls.

But Trolls are only counterfeits, made by the Enemy in the Great Darkness, in mockery of Ents, as Orcs were of ELves. We are stronger than Trolls. We are made of the bones of the earth. Treebeard

Hope that helps you! [img]smilies/smile.gif[/img]