Mocking birds are great at catching insects in flight, never see them at the birdfeeders eating seeds. However, I do see them eating (besides bugs) tons of berries and other fruits, so I can see them eating tomatoes and peaches.
I allow many berry-producing plants to grow and it seems to keep them happy and away from my tomatoes, although I did once have a blueberry bush that I purchased and could only harvest one or two berries off of it
Some of the plants/weeds I allow to grow to appease our state bird: Pokeweed, Beauty berry, American Nightshade, various greenbrier vines in the Smilacaceae family.