The answer for a dart frog is simply: none of them
No human food should ever be shared with a dart frog — not bread crumbs, cheese, fruit pieces, meat, cereal, sweets, or salty snacks, and not even a small taste. A dart frog is a specialist measured in grams, hunting live prey the size of a pinhead, and everything about its feeding is miniature. A crumb that looks trivial to you is a boulder of salt, oil, and preservative in this frog's world, and it will sit in warm leaf litter growing mould while the frog walks across it.
Absorbent skin makes food a contact hazard
A dart frog does not have to eat a human food to be harmed by it. Its skin is a working organ that absorbs moisture — and whatever is dissolved in that moisture — directly. Oils from crisps, salt from snacks, sugar syrups, and seasoning residues that reach the enclosure floor or the frog's water source pass through that skin in a way they never would for a dog begging at the table. This is also why hands that have handled food need rinsing before reaching into a dart frog enclosure, and why nothing edible for humans belongs on the rim or lid where fragments can fall in.
Size alone rules the human menu out
A dart frog's prey is defined by its mouth: fruit flies, springtails, tiny isopods, and pinhead-sized insects, all alive and moving to trigger the strike of its sticky tongue. No human food comes in a form this frog can take, and soft foods smear rather than sit as prey. But the deeper issue is nutrition: a dart frog's wild diet of leaf-litter invertebrates is recreated in captivity through live cultured insects dusted with calcium and vitamin powders at feeding time. A piece of banana or a crumb of biscuit contributes nothing to that system while displacing the hunting behaviour and supplement intake the frog depends on.
Running the feeding routine this frog actually needs
Feed a dart frog small amounts of cultured fruit flies or similar micro-prey, dusted, scattered so the frog hunts across the enclosure floor rather than crowding a dish. Cultured is the key word: wild-caught insects from the garden risk pesticide exposure, and anything collected near a kitchen or compost heap has already walked through human food residues. Keep the enclosure's humidity and shallow water clean, because a dart frog drinks through its skin as it sits. If a food item for people does fall into the vivarium, remove it and the litter beneath it promptly rather than leaving the frog to encounter it.
Signs a dart frog has met something it should not
A dart frog exposed to salts, oils, or contaminated material may stop hunting, sit hunched with its limbs tucked oddly, shed skin abnormally, or lose the bright alertness these frogs normally show. Because dart frogs decline quickly at their size, any frog that refuses its fruit flies for more than a couple of days or looks swollen or lethargic deserves a prompt call to a veterinarian who treats amphibians, with honest details of what entered the enclosure. The household rule that prevents most of it — nothing but dusted micro-prey ever goes in — belongs where every helper sees it: on the dart frog's KinsLe Care Teams list, next to its feeding days and misting duties.