Where are you located? What is the color of the rocks and pebbles around your place? That green poop is the color you get when a chicken picks up grit that has copper in it. It is not the dark green you see when a bird is not eating.
At ten weeks, he's growing some serious feathers so yes, his energy levels may suffer.
At ten weeks, he's growing some serious feathers so yes, his energy levels may suffer.