Wooden spoons

Can Wooden spoons be koshered?

Yes
See Laws of Koshering (Hag’alah and Libun)

I might be missing something (it would not surprise me at all if Passover cleaning has turned my brain to jelly), but I read the info on Hag’alah and Libun three times and I don’t see anything about wood (like bamboo or wooden cooking utensils) … Can you help a brother out?

Definitely! The laws of hag’ala apply to wooden utensils just like metal ones.