The pic of the dropping looks 'normal'. I don't think it's Coccidiosis! The other pic of them laying about the brooder, appears they are 'heat stressed'.
It's definitely not UE, ulcerative enteritis.
The only other thing that might possibly be the cause is Aspergillosis...of which there is no cure/medication. Only strict biosecurity measures and good sanitation will help prevent Aspergillosis. They can inhale dust, molds from the shavings that are contaminated with spores.
I also, don't think its quail bronchitis, if they had that, they would be having respiratory distress, coughing, sneezing, raling and watery droppings.
Sorry, not much help but those are the 3 most common ailments that can inflict quail in domestic environments.