In the Appendices of Return of the King, it says that the Trolls could have been "corrupted" in mockery of the Ents. Since the latter race was "made" primarily out of wood, or wood-like materials, the trolls were made out of stone, or stone-like materials. In the darkness that hid all deceit, they could keep their semblance of life, but once they came out in the Sun, which lays bare all deceit and trickery, they reverted back to their original forms, creatures of stone.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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