The Collaborative International Dictionary of English v.0.48:

Frolicky \Frol"ick*y\, a.
   Frolicsome. [Obs.] --Richardson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frolicky
    adj 1: given to merry frolicking; "frolicsome students
           celebrated their graduation with parties and practical
           jokes" [syn: coltish, frolicsome, frolicky,
           rollicking, sportive]