But even as they retreated, and before Pippin and Merry had reached the stair outside, a huge orc-chieftain, almost man-high, clad in black mail from head to foot, leaped into the chamber; behind him his followers clustered in the doorway. His broad flat face was swart, his eyes were like coals, and his tongue was red; he wielded a great spear. With a thrust of his huge hide shield he turned Boromir’s sword and bore him backwards, throwing him to the ground. Diving under Aragorn’s blow with the speed of a striking snake he charged into the Company and thrust with his spear straight at Frodo.
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This was the cave troll in the film, and also The Fellowship felled the troll in the movie.
