Synonyms for Jackstones (same or very similar meaning)
WordNet sense 1 (game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks):
jackWordNet sense 2 (a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball):
jacks, knucklebonesFrom the ODE community, based on WordNetadd/edit