Puppets in SW: none.

Puppets in ESB: Yoda, the greatest puppetry in motion picture history. Theres also the wampa in one shot and the space slug, both of which are acceptable.

Puppets in ROT: Jabba, a great performance that brought a real character to life. Yoda, continuing the jaw-dropping work of ESB. There's also the Rancor, which continues to be a pretty impressive effect (matte lines aside, which are now erased anyway), plus Salacious Crumb, which is a pretty underrated little side-character. Then there is Sy Snootles and the Blue Elephant, which look dumb.

So really, it comes down to Sy Snootles and the Blue Elephant looking dumb. But then in the SE, Sy Snootles looks equally dumb, just in a different way, and the sequence goes on much longer. So the only real exclusive is the stupid Blue Elephant, who has about ten seconds or less screentime in the few cut-aways that he's featured in.