I honestly believe the Ewoks had the potential to be nasty little buggers in a fight. In the novelization, Leia's first impression of Wicket is tempered by the fact he's got a knife. Although the description is probably of Kenny Baker's costume, as he was going to do the scene before falling ill.

I thought this guy was kind of scary close up...

It kind of seems like the more scary looking Ewoks got nudged into the background as the film progresses. (George can be seen micro managing the Ewoks a bit in The Making of a Saga doc.) I was pretty surprised a lot of the action figures have knives when we didn't see them being used in the movie.
There's the possibility things were toned down in the final editing. There's still a shot of an Ewok brandishing a stormtrooper gun that made the final cut, and I think some of the unused Jedi footage in Battle for Endor has some of them shooting. Without knowing what was left on the cutting room floor, I can only speculate.