Man, I tell you, if you guys don't beat all. I remember this one too. It's been ages- but here's what I remember.
Yes, Jim voiced the Daddy/Fat Blue Muppet, and Frank was the son. It looked like he was pink, had red hair, and had a striped shirt on.
The son asked if they could switch roles, and it was very touching. They also picked up a worm or a caterpillar, and the son (acting as the Daddy) said it was okay to touch it and pet it, it won't hurt.
The Daddy (acting as the son) climbed the tree (you can actually see one of his legs as he climbed higher- never saw anything below their waists before!)
and fell, but the son (as the Daddy) kissed his bump and made it better.
Then the son decided he would rather go back to being himself, and his Daddy be his Daddy again. The two walk off, and some very soothing music plays. They say something at the very end, but God only knows if anyone can remember it.
This was a very nice clip, and it's too bad that those who are under 30 will never have any idea what we're talking about. I'm 37 now, and by the time I was six (1974) this one seemed to get taken out of rotation. Guess you had to be there.
