This is a wonderful thread
I sure hope that they make a Muppet LOTR version in the future (everyone send letters!). It would rock!
But, oh gosh, I know all these characters but I don't know there names. I love them a lot though. They are all a major part of my childhood, but the old guys, who could they play? Well they could be both Theoden and Denethor. But remember they are always on the side making fun of the major characters (they never, never have major parts). Maybe they could be a pair of annoying people who pop up everywhere. Like they could be beer drinkers in Bree, and people in the crowd during the corination in Gondor.
I think though that Kermit would have to be Frodo, and Fozzy most definitely Sam. They are best buds in all the Muppet movies, so they have to be best buds here (and besides Kermit is much too not brave to play Aragorn).