Can they? Yes [as long as you're sure it's pesticide / fertilizer free].
Will they? Depends.
My colony rarely eats any greens I put in there.
Example: whenever I do strawberries, I always take the cut off tops and dump them into the colony.
A day later, they've picked every ounce of actual strawberry clean and leave behind the leaves. They don't seem even slightly interested in the leaves.
They like a lot of things, but green leafy stuff doesn't seem to be one of them (at least for my colony, I've heard of other colonies that seem to love greens).