I can play Doc. Though his part won't be much. Just his doing stuff in his workshop or one room of his house that has the hole the Gobo I think is his name is, has to sneak out of to get postcards his uncle Mac sends to him. I assume we're going with the U.S. Doc and not the ligthouse keeper british version, nor the french chief doc that I've read about?
Or I can do the dog also since those 2 don't interact with the fraggles much. Doc has no idea they exist and the dog just chases Gobo if he sees him. Apart from that the Doc and his dog segments are pretty much isolated and apart from the fraggle parts from what I've seen. You can cut the doc segments out and it would not effect the fraggle parts at all. But if you cut out the large creatures, not sure if they are gorgs or not, but if they were cut out then the series would obviously would be missing parts, unlike the Doc segments. The Doc and his dog segments I could do by myself. Posting when I get an idea, since they are, from what I've seen, totally separate from the rest of the goings on in the rest of the fraggle episodes.
Also if it is just us 3 then maybe to make sure the key parts are played each of us could take 1 of the huge creatures, not sure what they care called. The ones that have a garden the fraggles sneak into at times and the trashheap is not to far from their home I think.