Meetles are most certainly not adult Fuzzles. Meetles are Meetles - Fuzzles are Fuzzles. 'Baby' Meetles are called Meetle Grubs, carnivorous Meetles are called Mugs and herbivorous Meetles are called...well, as far as we know...Meetles.
There's been absolutely no official mention of them recently, so Idunno. If they are still in Munch's Oddysee, can we still expect to fly about in Meetle Balloons, or get chased by Meetle Tanks? Or feed Meetle Grubs on what we choose?
Oh, and by the way, here are two pictures of Mugs:
And a production image, which looks very different:
I'm sorry I couldn't find the one with the legs.