A shonk eh?
Yup, he's a shonk alright. Not to be confused with a
shronk which of course is related to playing fizzbin, as Capt. Kirk has explained.
I grew up watching
Sesame Street. That's a puppet for sure. Watch the movement of the 'legs' not quite conform to the horizontal travel.
The cave thing starts at 8:52. Can't see much except it's the same puppet. All he had to do was stand still another couple of seconds. He had been proceeding slowly then paused - because he knew what was about to happen. You go into a dark cave with a flashlight to find your Lucky Charms and the instant you find the thing you're looking for you run away.
On the way in he's filming the walls and ceilings and I was wondering if he was just avoiding the tracks the person who went in ahead of him (with the puppet) made. At the very start you might see them, I wasn't sure.
A beard and a floppy had do not credibility make.