Pipidae have powerful legs for swimming and lunging after food.
From the en.wikipedia.org
Pipidae are scavengers and will eat almost anything living, dying or dead and any type of organic waste.
From the en.wikipedia.org
They enjoyed watching the pipidae frog shed his tail and grow arms and legs when he was young and named him for the large shell he enjoys climbing in his aquarium.
From the dailyherald.com
More examples
Tongueless frogs
The Pipidae are a family of primitive, tongueless frogs. The thirty species in the family Pipidae are found in tropical South America (genus Pipa) and sub-Saharan Africa (four other genera).