It’s a puppet.
http://www.starwarschina.com/forum.php?mod=viewthread&tid=15587&extra=page%3D1
Maybe they shot him with a high speed camera to make the tongue effect work better? That may be why the movement seems different.
I think we’ve all gotten a little paranoid about SE changes. I even thought this pig guard was an SE addition when I hadn’t watched ROTJ in a while. 😉
