WordNet sense 1 (an artifact designed to be played with):

plaything

WordNet sense 2 (copy that reproduces something in greatly reduced size):

miniature

WordNet sense 3 (behave carelessly or indifferently):

dally, flirt, play

WordNet sense 4 (any of several breeds of very small dogs kept purely as pets):

toy dog

WordNet sense 5 (manipulate manually or in one's mind or imagination):

diddle, fiddle