Synonyms for Scrunch Up (same or very similar meaning)
WordNet sense 1 (sit on one's heels):
crouch, hunker, scrunch, squat, hunker down
WordNet sense 2 (make wrinkles or creases into a smooth surface):
crease, crinkle, crisp, wrinkle, ruckle
From the ODE community, based on WordNet
add/edit