When was the last time you held a frog in your hand? ...and yes! This frogs are really blue. Frogs and toads can be found here, the tracks are from the BBC Nature Sound Library with more than 100 frog sound effects.
Avosound News
Author: Guido Helbling, Avosound
December 12, 2016, [Weblink]
BBC Nature Sound Library - Blue Frogs