I am actively preparing to add some more arrowheads, mainly bone arrowheads, into the game. Basically, carving a bone into a few arrowheads and just copying another arrow recipe but swapping out the arrowhead. And this got me thinking, there could be so much more.
Look at e.g Arrowhead - Wikipedia
Even a sharpened nail could be a makeshift arrowhead. Maybe even flint or obsidian (not the main point here, but the cataclysm brought lava into new england, so there should be obsidian) arrowheads would make sense.
And maybe even bone spear points are in reach now, too. Aargh, I am doing it again. This is out of scope.
Anyways. Making Bone Arrowheads - YouTube shows that one could utilize the carving skill instead of knapping to create bone arrow heads. Maybe both to break the bone into pieces.
One could also create advanced™ arrowheads which have vicious, I forgot how you call it, edges or crevices which cause damage when you pull the arrow out. Pulling arrows out of your limb is not implemented yet, but such an arrow could still get a small bonus to cutting damage.
Currently a bone seems to be 6 cm long, so you can get 2 arrowheads from one bone perhaps.