Can you post some photos of the chickens, the poop, their housing/environment and the feed (label/bag) you are using?
Honestly, I would but some kids stole the entire feed bag yesterday! More is arriving tomorrow. I'll try to get photos of the poop. Their coop is around 8 feet by 10 feet, and there are 5 chickens. If I could get them a bigger coop, I would, but I have 0 control over this
How old are they?
3 and a half
Are you a student of the school or a teacher - is this an FFA or 4-H project?
I'm a student, and this is a... idk... the funds for caring for the chickens are through the school, but it's a weird setup. It isn't 4-H.
How often are the chickens tended to - are they watered and fed everyday, how often is the housing cleaned?
Watered and fed everyday by me, deep coop clean twice a year, bedding changed every 3 months or so.
Do they get fed anything else besides poultry feed- scraps, vegetables, etc.?
YES. A group of kids is feeding them Cheetos and soda! They have a pending suspension from school for this right now, but kids feed them all sorts of sh*t!
Do you have vet care available - if so, that would be best.
Yes.
Green poop is sometimes associate with infection, malnutrition, worms or coccidiosis.
If they are eating a LOT of green veggies, then the poop could have a green tint as well.
Kids feed them tons of tomato leaves, which are part of the Nightshade family, therefore bad for them, so that could be causing it.
Having sticky caked on feces is not good for them - is there a way to clean them up - they would need to be dried thoroughly before placing them back outside since temperature are cooling off - don't want them to get chilled.
Check the feed to see if it's a complete poultry feed that is appropriate for the age of chickens you have. Look at the date to make sure it's not too old and give it a look for any signs of mold or see if it smells rancid.
When we get more information, we may be able to assist you better.