Is there a name for the vocal technique used for characters like Sméagol?

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?