Wait, what are you feeding them when NOT crickets? Mine always ate crickets (and fruit, they were day geckos).
Up until now I’ve been feeding them a MRP (Meal Replacement Powder), which is supposed to be a complete diet. It was pioneered by an American herpetologist to allow people to keep geckos without having to maintain live food colonies. Most sp. Rhacodactylus breeders now feed primarily MRPs, and offer live food maybe once or twice a week because it helps pack on the weight for breeding animals. Since I’m not a breeder, I’ve been keeping my two on MRPs and am now introducing (or trying to introduce) crickets as an enrichment thing.
tl;dr - Commercially-produced complete diets. In two flavours!