It looks like they have been feather picked, and maybe vent pecked. That can happen with overcrowding, too little protein in the diet, not getting out to free range, boredom, agressive breeds, too much light in the coop and others. Are they eating and drinking well? Give them flock raiser feed 20% protein for awhile, and some crushed oyster shell in a separate pan so they can take some if they need it.
The third pic looks like a normal cecal poop. The white urates continually dripping sometimes can be due to vent damage, or possibly to dehydration or vent gleet, a fungal infection.
I would offer the flock raiser feed, clean water every day, and give them some probiotics in their water several days a week, and see if it helps. Watch for any feather picking, and sometimes using Nustock cream around the vent may help. It tastes bad, hides red skin, is antifungal and antibacterial, and may help prevent picking.
https://www.amazon.com/s?k=nustock&...892188&tag=googhydr-20&ref=pd_sl_4bid0cowut_e
Here is an article on vent pecking:
https://poultry.extension.org/artic...ibalism-in-small-and-backyard-poultry-flocks/
