Is green poop normal in a breastfed newborn?

Green is OK. Poo can run the color spectrum from very dark green thru lighter greens to yellows then brown.It all depends on the action of gut germs that convert the very dark bile to lighter shades over time. Geen = less time in the system.
Yes. The bowel movements can vary in color from brown to yellow to green. With formula fed babies, as well.