What a fit green tree frog looks like
A green tree frog in good condition is softly rounded but not plump: the body has a gentle oval shape, the legs look proportionate, and the disc of the ear — the round tympanum behind the eye — sits clearly visible with only a modest fold of skin above it. These frogs are not angular animals, so the judgement is one of degree. A resting frog should still look like a frog that could leap to the top corner of its tank without effort, not like a green dumpling settled into the leaf litter for the evening.
The ear fold is the clearest gauge
On a green tree frog, the most reliable fat indicator is the supratympanic fold, the ridge of skin running over the ear disc. As the frog gains, that fold fattens and bulges outward and downward until it begins to overlap and hide the ear itself — keepers describe well-padded frogs as having their ears 'buried'. Fat also rounds the belly so the frog looks swollen side-on, pads the thighs where they fold against the body, and can form soft bulges behind the jaw. Movement completes the picture: an overfed tree frog climbs reluctantly, jumps shorter distances, and spends its nights low in the tank near the feeding spot instead of up in the foliage.
Why captive tree frogs gain so fast
A wild green tree frog hunts across branches all night, misses often, and burns energy simply being a frog in moving air. A captive frog perches above a feeding bowl or watches insects released at the same hour in the same corner, striking from a few inches away. It needs far less than its appetite suggests — and its appetite is considerable, because a frog is built to gorge when prey is plentiful against lean nights that, in a tank, never come. Adults generally maintain condition on two or three feeding evenings a week, a handful of insects per sitting sized to the frog, offered over a short window rather than a constant supply wandering the tank.
Cutting back a green tree frog safely
Reduce sittings before you reduce variety: move a nightly-fed adult frog to three evenings a week, then two if the ear fold is very developed, offering a counted few insects each time and removing uneaten ones after the sitting so the frog is not snacking at midnight. Keep a shallow, clean water dish always available — hydration is not part of the ration — and judge progress by the ear fold and the profile over a month or two, since frog weight shifts slowly. Photographing the frog from above beside a familiar leaf gives a comparison that memory alone will not. Expect the frog to watch you hopefully on off nights; that is hunting behaviour, not hardship.
Fat or fluid: when a round frog needs a vet
A round green tree frog needs a vet promptly if the roundness arrives suddenly, if the body feels bloated and tight rather than soft, if the skin looks stretched and shiny, or if the frog stops feeding and sits in its water dish for long stretches. Bloating from illness or fluid retention can imitate overfeeding, and it moves faster than any diet problem. Lethargy, skin sores or a frog that cannot right itself are same-week concerns, not watch-and-wait ones. If the vet confirms simple overconditioning, the spaced sittings will do the work — and noting each feeding on KinsLe's Care Teams, ticked off when done, keeps everyone who enjoys feeding the frog from quietly adding sittings back.