There could be 2 types of goblins, the normal goblins and the berserker goblins.
The normal goblins will drop a Heavy Club, which would be a level 9 weapon that deals 40 base damage. It will be a thicker version of wooden club.
A variant of the goblins, berserker goblin (level 11 goblin), will wield and drop a Bronze Club, which would be a level 11 weapon that deals 45 base damage, and is useable by all classes. It would technically be the best adventurer weapon.
I don’t think having goblins dropping wooden clubs, especially frequently, is the best idea, unless that is a placeholder for a planned drop in the future.