Among the actors who regularly were suited up as orcs in the movies was one woman, Amanda. According to the Making of TTT, she was the orc to whom Saruman addressed the order to send out the warg riders. And in one of the features one of the assistant directors, IIRC, said if he wanted Amanda herself while in the set of the Helm's Deep battle, he had to follow her voice, as the Uruk Hai costumes made it impossible for him to identify her in any other way.

BTW, the child who depicted Eldarion was the son of the orc with the whip outside Shelob's lair when they found Frodo's body, and the one whose warg steed carried Aragorn off the cliff. One guy who reminded me of a Samoan was a servant to Saruman in TTT and the rider of an Oliphaunt in RotK, a fact I'd guessed but was confirmed on research.