
Continuity mistake: Merry and Pippin were bound when taken by the Uruk-hai, and the bonds weren't cut until after they managed to escape during the fight. Yet, when the horse almost crashed down on Pippin, he had his arms spread out up near his face, not bound, even though they weren't cut until later. In the next shot, his hands are bound again. (00:31:15)
Chosen answer: "Do they give good sport" is simply a way of asking whether they're being kept alive to provide later entertainment; could they be used in some sort of organised hunt, could they serve as gladiatorial fodder in an arena fight, that sort of thing. The weird thing with the tongue really just seems to be a sort of odd tic, designed to emphasise his rather disgusting nature.
Tailkinker ★