Fun Facts Gleamed From Wikipedia
From List of Muppets:
If classified as a frog, [Jill the Frog] is the only female frog in the Muppet universe.
I like how Wikipedia people jump to the weirdest conclusions sometimes. OK so apparently we’ve only seen one female frog Muppet on screen, so of course that means there are no other female frogs, Muppet or otherwise, IN THE ENTIRE UNIVERSE. Did Doc Hopper wipe out an entire species when we weren’t looking?