Not so sure on the ID here, but it was suggested it looks like something in the Arthroleptis sylvaticus complex? Found at night on the forest floor in Korup National Park, Cameroon.
Arthroleptis sylvaticus is a species of frog in the Arthroleptidae family. It is found in Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Gabon, possibly Equatorial Guinea, and possibly Nigeria. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.