Lepidobatrachus laevis - the Budgett’s frog
Lepidobatrachus laevis (family Leptodactylidae) is a large, stout, aquatic frog with a dorsoventrally flattened body. In both sexes the head is large and robust, composing approximately 1/3 of the total body length, and broad to make room for the extraordinarily wide jaws of these animals .
This frog has many common names, it is named Escuerzo in Spanish, and in English: Budgett’s frog, Wide-mouth frog, Hippo frog or even ”Freddy Krueger” frog (due to their disturbing screech and aggression 
This species is known from northern, central and eastern areas of Chacoan environments: Argentina, Bolivia and Paraguay .
Photo credit: ©homerosimp | photo taken in Orán, Salta, Argentina