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I'd avoid anything that looks like Queen Anne's lace--it could be hemlock. And avoid anything with a strong scent--many noxious plants have a strong scent. Also, avoid the leaves of nightshades (tomato, potato, peppers, eggplants, okra, etc.)
Otherwise, pretty much the world is your chickens' oyster! Mine enjoy prickly lettuce, lambs quarter, dandelions, dock, medic, chickweed, purslane, and dozens of other weeds whose names I have forgotten. I have huge hardcover book entitled "Weeds of the Great Plains" that I review every now and then to learn the names of some of my many weeds!