The knocking sand frog (Tomopterna krugerensis) is a species of frog in the Pyxicephalidae family found in Angola, Botswana, Mozambique, Namibia, South Africa, Swaziland, and Zimbabwe.Its natural habitats are dry savanna, moist savanna, subtropical or tropical dry shrubland, subtropical or tropical moist shrubland, subtropical or tropical seasonally wet or flooded lowland grassland, intermittent freshwater lakes, intermittent freshwater marshes, arable land, pastureland, and ponds.This species was discovered during the evening of 23 October 1973 in South Africa's Kruger National Park. Two weeks after heavy rain fell in the area, large numbers were found around the Machayi and Mathlakuza Pans in the northeastern part of the Park near the Mozambican frontier.