Examples from the Web for knucklebones
The draught-men employed were knucklebones of sheep, some blackened.
They all seemed very merry over a game, much like "knucklebones," which they were playing with shells.A Modern Buccaneer|Rolf Boldrewood
This last is an exceedingly primitive and ancient game—it must date almost as far back as jackstones or knucklebones.War in the Garden of Eden|Kermit Roosevelt
Turning to his men, with his hand he brushed the knucklebones off the board.
We talk of dignity and propriety, and we are like so many children playing with knucklebones in a giant's scullery.The Return|Walter de la Mare