I don't know. They may eat them when they are ranging, but if you have them confined and the tomato leaves are the only green thing they get, it may not be a good idea. They may eat too many of them or something. It is hard for me to intentionally feed them something that I know is poisonous. When they get it themselves free ranging, I kind of trust them to know what's best but when I am feeding it to them and they are confined, it just seems.... different. Like maybe they won't know when enough is enough or something?