I haven't tried dehydrated fruit, so I can't say. Young Beardies eat mainly crickets (I think it's like 80% crickets to 20% fruits/veggies) Just stay away from citrus and other highly acidic foods.
Get a few dozen crickets, my little girl eats 6 at a time 3 times a day... luckily at my local reptile shop it's $1.50 for 50 small crickets