Llankibatrachus is an extinct genus of prehistoric frogs in the family Pipidae. They are known from Argentina. The type species and the only known species, Llankibatrachus truebae, is named after Linda Trueb, a herpetologist from the University of Kansas. The species is known from two deposits near the Nahuel Huapi Lake in north-western Patagonia, Argentina. The finds include nearly complete specimens with impressions of skin, and individuals of different developmental stages, including tadpoles.