For those who want “Sesame Street,” and especially the Muppets, in exhaustive detail, here’s a Wiki on everybody’s favorite puppets. It’s not that old, and is still growing, but there are currently 5,615 articles there.
Drill down to “Sesame Street” right here. For a sample, click on Big Bird Through the Years.
As for Cookie Monster, who seems to enjoy chewing things but never swallowing them (such is the life of an overgrown sock puppet), HE USED TO HAVE TEETH. Yikes.