Can Mourning Geckos Eat Pinhead / small crickets (2nd–3rd instar only)?

Yes. Complete Gecko MRP (meal-replacement powder) — fruit/nectar blend is a staple feeder for mourning geckos. The backbone of the diet for most keepers.

Yes. Repashy MRP (Crested Gecko Diet / Grub Pie, used off-label) is a staple feeder for mourning geckos. No brand makes a mourning-gecko-specific MRP, so keepers use the same Pangea/Repashy powders formulated for crested and gargoyle geckos — the nutritional profile suits a small nectivorous/frugivorous species just as well.

Yes. Fruit Flies (Drosophila melanogaster / hydei, flightless) is a staple feeder for mourning geckos. The single best live feeder for this species — actually sized for a mourning gecko's tiny mouth, unlike almost every feeder insect marketed for reptiles generally.

Yes. Springtails is a supplement feeder for mourning geckos. Primarily a bioactive clean-up crew, but a self-sustaining culture in the substrate also gives hatchlings and juveniles a source of correctly sized live prey to hunt between scheduled feedings — genuinely useful for a species this small, not just decorative..

Yes. Honey water / diluted nectar (occasional) is a treat feeder for mourning geckos. A drop of honey diluted heavily with water on a leaf mimics the floral nectar this species forages in the wild and is a good occasional treat — never a diet replacement, since it supplies sugar with essentially no protein, calcium, or vitamins.

Yes. Mango or papaya (tiny mashed pieces, occasional) is a treat feeder for mourning geckos. Ripe, soft fruit mashed into a smear is a fine occasional treat reflecting this species' natural frugivory, in tiny amounts given the gecko's size.