KILL

KILL KILL KILL KILL KILL KILL HERE ARE SOME UNGA BUNGA WEAPONS

Stone spear, axe, mallets, knives: classic neolithic stone weapons/tools. All are one handed except for the spear. Some people think the sword is the archetypal weapon of mankind, but the spear is a certified hut classic. 

Bow and arrow: Also pretty classic, definitely possible for the tribes to have even made their own versions of longbows (fit to be used by insanely strong hunters). I'm not even gonna put an actual image here, you can figure out what this would look like.

War clubs: Maori clubs also exist but they kind of just look like paddles. The first image is an example of a native american war club. The second shows two other types of war clubs, fijian. The third is a root club, which is sick as fuck. Historically, these tended to be one handed weapons, but I won't cry and shit myself if the PCs used two handed war clubs.

Spear slings: Hilarious chad weapon. Crazy thing: world record throw for one of things is over 848 feet. Would that be accurate? Probably not, but I like the idea of a war painted barbarian taking aim at some milklander archer and nailing a spear arrow through their stupid little head. 

Obsidian based weapons: macuahuitl are great. I'd probably let someone count it as a two handed weapon. King of like a weird greatsword. Obsidian knives and cutting edges are very nice. Obsidian is rather fragile so carved swords were never used, but obsidian knives are usable. 

Bone stabbers: Human (or maybe non human) femur bones sharpened into stabbers. Unbelievably cool. Almost anything made of bone could also have hypothetically been made from the bones of longstriders (supposed giant-kin) during the Revanwall super genocides.

100% fantasy world shit: Jawbone kukris are mentioned, even though they don't actually exist. I don't care though. Gigantic predatory jawbones could easily be turned into axe heads or war picks.

Carved giant bones can probably be used as big ass war clubs or spikes. There's definitely something to be done with mammoth tusks, and the fangs of giant beasts and spiders are probably usable as the killing bits of weapons.

There are definitely weapons to be made from monster materials. But the point is that, in general, spears and clubs are some of the easier things to make using the methods of the tribes. In order for a sword to be useful it will probably have to be made from metal. You definitely can also say you took metal weapons from a lowlander, but most tribesmen would not consider metal weapons particularly superior.

In the Veins, most weapons made by cultures down there use bone and stone exclusively (wood doesn't grow very well). It may also be possible for PCs to have traded/obtained a sword or certain type of weapon from the caves. Examples include mantis-shrimp swords and scissorfish knives. 

All said, a well made spear or war club will not fail you.