They come out of the ground, man. Out of the ground. Fifteen of 'em in a little cocoon I found buried in the dirt.
Only logical explanation is they are the larval form of the worms that are seen undulating around. Worms migrate to Azj-Kahet, lay their eggs, eggs hatch into chickens, chickens work their way to Hallowfall, chickens mature to become worms.
Vertebrates have eyes. Chickens do not have eyes. Chickens are not vertebrates. (Except the ones with visible eyes, those are fine. Silkie chickens are worms.)
Does this mean Francois is a worm? Yes. Yes it does. How do you think he got so rich? By infesting chickens and stealing their form. Before he became Francois he was something much more spidery. But that was just the last form he took. There was one in that old clown, it came down from the twisting nether. It eats children. It wants their forms, too. In time it shall have them.
Make it Rain does not create gold coins. Those are eggs. Worm eggs.
Moreover, the sci-fi trope of alien thing that looks cute and isn’t, or has some horrifying feature that soon rears its ugly head, applies fully to the World of Warcraft universe.
You think WoW doesn’t go there? Oh it does.
“Who is there? Someone? Did I imagine you? I am Albert. I was a Pathfinder once. Now that I’m blind, I see no path. It seems wrong to call myself Pathfinder Henson. I can hear, though. I can hear them eating. They eat the fresh parts. My eyes. My insides. It hurts all the time. They do not want my rotten pieces. The decayed parts are all I have left. The worst of me. I wasn’t alone here, I had fellow Pathfinders. I keep hearing sobbing from the walls. Do you hear them too?”
The larvae that were inside of Albert, eating him, guess what? They ate chickens too.
The chickens are not what they seem.