WordNet (r) 3.0 (2006):

rollick
    v 1: play boisterously; "The children frolicked in the garden";
         "the gamboling lambs in the meadows"; "The toddlers romped
         in the playroom" [syn: frolic, lark, rollick,
         skylark, disport, sport, cavort, gambol, frisk,
         romp, run around, lark about]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "rollick":
   antic, bask, bluff, bluster, bluster and bluff, bounce, brag,
   bully, caper, caracole, carol, carry on, cavort, chirp, chirrup,
   clap hands, curvet, cut a dido, cut capers, cut up, dance, delight,
   dido, disport, exult, flounce, fool around, frisk, frolic, gambol,
   gasconade, glory, hector, horse around, indulge, intimidate, joy,
   jubilate, lark, lilt, luxuriate, out-herod Herod, play, rage, rant,
   rave, rejoice, revel, roister, roll, romp, sing, skip,
   skip for joy, slang, splutter, sport, sputter, storm, swagger,
   swashbuckle, trip, vapor, welter, whistle