The Hogsback frog or Rattray's forest frog (Anhydrophryne rattrayi) is a species of frog in the Pyxicephalidae or Petropedetidae family. It is one of three species within the genus Anhydrophryne. It is endemic to South Africa.
This species is known only from the Amotola, Katberg and Keiskammahoek Mountains in the Eastern Cape Province of South Africa. There is a record from near Patensie, some 200km south-west of the main range, but it has not been found in this area since it was discovered in 1961. It occurs above 1,100m asl.