Frogs

Unfortunately I accidentally deleted the message that Campbell sent me with the name of the 'frogs' but I do remember that he said it was actually some kind of toad, not a frog.
I will ask him again though.....

I have an answer for you now - the 'frogs' that we hear at Nkorho are, in fact, Olive Toads Bufo poweri which are on the IUCN Red List for South Africa

Bufo poweri is a morphological variation of Bufo garmani (true Olive Toads) which are found in Northeast Africa

Wow! Thank you so much for telling me!

More about the Olive Toad:

Bufo garmani is found in Southern Africa although there seems to be some debate on the subspecies.

Eastern Olive Toad Buto garmani

Up to 100 mm. Above: Pairs of dark patches on the back. Occasionally there is a thin line down the spine, starting from behind the head. Head pattern: Patches behind the eyes are not fused into a bar as in the Raucous Toad. No patches on the snout.
Below: Granular white skin. The male has a dark throat. Limbs: Red colouring on the inner legs. Habitat: Breeds in savanna pans and farm dams. Males form large choruses, calling from partly con­cealed positions on the banks. Call: A loud bray of about a third of a second emitted approximately once a second.

I assure you Tabs.... we learn well his call