Grow tomatoes in chicken proof cylinder cages up to a trellis to drop tomatoes to the chickens till frost. I made mine out of concrete remesh, and then wrapped with finer mesh around to keep the chickens out.
Trees, if planting in an established run, will need to cage them until large enough, I'd suggest a variety of fruit trees to stagger the free food dropping to the chickens, mulberries in the spring, then stone fruits, then apples, then persimmons (in the Midwest)
(See my BYC page for the huge Mulberry trees in my run)