Rhadinosteus

Rhadinosteus parvus (meaning "long slender bone") is an extinct species of prehistoric frogs that lived during the Late Jurassic.[2][3][4] Fossils of the species were found at the Rainbow Park site in Utah's Dinosaur National Monument, from several slabs of rock which contain multiple partial specimens. R. parvus was likely a member of Pipoidea and may have been a member of the Rhinophrynidae family.

Description
R. parvus was a moderately sized frog, 42mm in length. Unlike the other members of Pipoidea its skeleton is not specialized for any specific task (such as aquatic life in Pipimorpha species).