What a strange way to feed an animal! Although I think that captive reptiles and amphibians are usually overfed, waiting 10 days between meals is excessive. And I completely disagree with the volume of food provided at that time. It is not healthy for an animal to eat one large meal instead of several small meals.
If the animal was healthy and had normal fat storages, it should have survived 14 days with no problem. Since the animal was wild caught, it probably was not treated for parasites. The stress of captivity, and frequent and unnatural meals, and the presence of parasites probably is what did this frog in. I suspect that the owners are not very knowledgeable on the husbandry of reptiles and amphibians. And I have to wonder because of the odd feeding schedule, what else about the animal's habitat was incorrect (what size tank is the frog in and what kind of filtration does it have?). I ask you to strongly urged the owners to visit this forum and do proper research on these animals. And any wild caught animal should be dewormed.
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*Humans aren't the only species on earth... we just act like it.
".the oldest task in human history: to live on a piece of land without
spoiling it."
Aldo Leopold (1938)