Green poop could simply be something they ate and perfectly normal. Maybe they have eaten a lot of grasses.
If you feel that this is not normal then...
Is it possible to post a picture? What shade of green? Is it runny?
This might help. It's a poop chart for chickens but much of it applies to turkeys. It will give you an idea of what is normal vs abnormal. You will notice a lot of normal green poops. If it looks yellow and frothy then there would be some concern for worms or blackhead.
Poops can tell a lot about the health of a bird. It's very good that you took notice. They can change often depending on what they have eaten. I've seen my Ducks go from a normal poop one minute and dark green the next mainly because I gave them a helping of kale in between.
If you see a pattern of what may not be normal (i.e. always runny or foul smelling, etc) or a major color change that remains consistent, or just anything out of the ordinary. We are here to listen and advise you for proper care and treatment. I'm glad that today we can put your mind at ease. .