Well Dwarves would create the wooden weapons if they had nothing else to work with, because supposedly they love crafting things.
otherwise I would never think of them using them.
But that glass idea is relativley good because most volcanic glass is very sharp at just a couple smacks. And archeologists say that the cavemen had some speartips as sharp as surgical steel, some say sharper.
But most rank and file weapons had some wood content and spears caught on in many military applications not just because they didn't allow enemy soldiers to get close enough to attack without risking bodily harm.
but because they didn't use much metal all the metal was used in both tips of the spear one that was bigger to attack with and another that was meant to dig into the ground to resist a charge from a mounted opponent or just somthing really big, also most spears use about 1/5 of the steel needed for just a normal sword.
Yes wooden weapons are wrongheaded but a spear made entirley out of wood would very well work. Possibly balanced for throwing making a throwing spear (called a javelin) used much like the roman pilum but it wouldn't stick to armor or sheild making them too heavy to use. using them with an alatl much like an aboriginal woomera for you aussies it could probably have enough force to break through some armor most notably chainmail if it doesn't have its proper padding.
that and more once I remember what oh yeah..
Also you could chop down trees then say what the wood should be used for such as chopping A block of wood about six feet high then dragging that to a woodworkers shop where he could use a tool to hammer out shafts.
this tool is made from metal and is a cicular blade attached to a thin strip of metal attached to a round/flat bar to hold and hammer cutting downwards through the wood starting from the top because its thinner making a shaft about 5 for a good thick tree..Ashwood Is best if I remember correctly
The spear is a good weapon to be used en-masse because its cheap and more effective to a point the more you make.
also you can make them longer so about three line of soldiers can attack one line of swords..
If you guess who wins you get a cookie..
Thus ending my rediculously long post about spears..