The curious case of Wetlands
Most of the lower level enemies in Wetlands don't drop loot. Murlocs don't have clams, oils or scales, gnolls don't have cloth, raptors don't have anything...but why? Why do you think that is? Its not really an issue because if you were looking for those materials they can be found in many other places but its so odd that they don't drop anything.
Maybe this was a measure taken against botting long ago and Warmane just sort of forgot about it. Maybe this is how it was in retail. Its just so weird because I've been to pretty much every zone in the game and only this one stands out like this, where most of the enemies don't have loot.