I generally recommend avoiding it. They get a lot of their
hydration from food, so I find it best to offer them live bugs (which have eaten fresh veges) along with a dish of fresh veges (which the little ones often ignore so that can then be sent to the bugs to eat). Offering as much variety as you can of fresh/live food will provide the best nutrition to your dragon.
To answer your question more directly, if you need a supplemental packaged food, I suggest having Repashy Veggie Burger or Grub Pie on hand.