You can feed a bunch of different fruits, off the top of my head I can't think of anything other then mango, squash, seedless grapes... these should not be used as an everyday food though, just as treats.

Also, keep the bok choy to a rotated treat as well, it shouldn't be used as a staple. Endive, escarole, chickory are great staples along with dandelion greens when they are available.

I would also be careful about feeding the dandelion flowers from the yard, they need to be 100% pesticide, herbicide free and not be from the front lawn as they could contain fumes from car exhaust. Hope that helps a bit.