i dont htink that dragons are going to eat fruits/vegies, while catching small insects is still worth while.
once they get bigger i think they may be more willing.
i have heard people feeding peas though, rolling the peas along, so that the dragons go after them.
i fed mine some peach once, by acting like some was a worm, but after that he refused, and would spit it out...
my dragon seems to be able to identify his food sources visually, often without movement. i have seen him take dead insects, or insects that are in their metemophasis, and insects that are plain not moving for whatever reasons.
also strange, i used to hand feed him worms all the time, and then one time he bit onto my finger and then let go. since then, he has refused to take from my hand, and instead closes his eyes.