I'll throw some input in here too.
Nibs loves squash of all kinds (including pumpkin - she went nuts at halloween!), collard greens, and kale. She absolutely hates parsnips and wont' even go near the food when I give them to her.
The little guy will eat anything you put in the tank. If it hits the food dish, it's gone within seconds. His favorite has to be strawberries, but he rarely gets them.