Arthroleptis crusculum is a species of frog in the family Arthroleptidae. It is found in southern Guinea, Liberia, Sierra Leone, and Côte d'Ivoire, at elevations of 500–1,750 m (1,640–5,740 ft) above sea level.

Its natural habitats are high-altitude grassland, gallery forests, and the edges of marshes. It is threatened by habitat loss caused by mining, agriculture, and livestock farming.

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