In the case of the black-spotted pond frog, it usually takes an average of 50 hours to excrete after eating other bugs. But the aquatic beetles came out an average 1.6 hours after being swallowed.

Leopard frogs will eat just about anything they can fit in their mouths. They sit still and wait for prey to happen by, then pounce with their powerful legs. They eat beetles, ants, flies ...

J. Gould et al., “Diving beetle offspring oviposited in amphibian spawn prey on the tadpoles upon hatching,” Entomol Sci, 22:393–97, 2019. While studying the conservation of endangered amphibians ...