Geckos that eat fruit flies and meal worms?

If you can't feed crickets, other alternatives would be mealworms, phoenix worms, dubia roaches, morio worms, silkworms and horn worms.

Fruit flies aren't substantial enough for any gecko, and they're also a pain to keep since they can easily escape and run all over the place. Mealworms are okay as a supplement, but they're very nutritionally imbalanced, not to mention that there is a known risk of impaction with mealworms because of their harder exoskeletons. I'd recommend looking into dubia roaches if not crickets, but very few people prefer roaches to crickets in my experience. The problem with practically any other worm is that they're also nutritionally imbalanced (more so than crickets), and many of them are high in fat content. Consider another animal if you can't convince your mom to go with a more common primary feeder. You could go with Crested / Gargoyle Geckos and do a strict CGD (Crested Gecko Diet) regimen, which is often done by breeders (and I do this with no problems); it's even more nutritionally sound than any insect + gutloading + dusting with multivitamin regimen.

I have a leopard gecko i only feed him mealworms and dubia roches but u can primarily feed mealworms i dont like keeping crickets