I notice a common pattern for voicing characters like Sméagol (Lord of the Rings), Stitch (Lilo & Stitch), Mogwai (Gremlins), and Jar Jar Binks (Star Wars Ep. 1) that involves falsetto and raising the back of the tongue to the roof of the mouth while talking. Is there a common name for that technique?
Pretty much, yeah, though it doesn’t have to be low, iirc. It can come from higher in the throat, and thus sound higher pitched as well.