I don't think there's much physical evidence for the use of war clubs in the stone age except a few skulls with blunt force trauma that could have also been caused by hand axe - it's mostly based off ethnographic studies of the Standard Cross-Cultural Sample [1].

IMO any culture that participated regularly in warfare would have figured out that sharp spears with long reach are far more effective than clubs unless that combat was largely symbolic. Clubs would make sense because they're not as lethal.

[1] https://link.springer.com/article/10.1007/s12110-023-09445-3