Since the Kermit the Frog puppet has very little inside its head, it is able to convey a wide array of emotions with just a few subtle movements of the fingers. One such expression is the Kermit scrunch, used to evoke a reaction of disappointment, embarrassment, disgust, discontentment, and frustration.
There are usually two visual examples of this emotion. One is made when the performer simply lowers their fingertips inside his head, pushing the front of Kermit's mouth downward. Another is to repeat this while raising one or more of the fingers inside and pushing it toward the front of the head, forming a visible wrinkle just above Kermit's mouth. Moving the fingers far apart or scrunching them up can give Kermit a more dramatic grimace whenever the scene (or the frog's life problems) call for it.