muppet · noun1
From Muppet, from the Muppets franchise
Muppet · noun2
Most likely a variant of moppet.
Muppet · noun3
Coined by Jim Henson as an alteration of puppet. Henson had claimed the word was a blend of marionette + puppet, but later recanted.
Etymology from Wiktionary, CC BY-SA 4.0.