Yes, I do know what you mean.
Kermit would always seem to dance, doing little side kicks with his feet below screen (of course he didn't have feet, but, ah hum)
He'd have his hands slightly out at his sides, and watch his feet as he danced, then glance up at the screen from time to time.
Is this what you mean? And can you clarify the questian, do you mean how was he performed?