WordNet sense 1 (occur in soft rounded shapes):

roll

WordNet sense 2 (of the margin of a leaf shape; not broken up into teeth):

smooth

WordNet sense 3 (stir up (water) so as to form ripples):

cockle, riffle, ripple, ruffle

WordNet sense 4 (move in a wavy pattern or with a rising and falling motion):

flap, wave