Cor, Dave there are loads!
eg:-
Baka
Hadza
San
Twa
Tuareg
Wodaabe
Pokot
Fulani

Some are semi-nomadic, and there are indeed clashes between settled farmers and the pastoral nomads letting their herd graze on their land.

They also tend to have pitched battles between themselves, especially in the Omo valley in Ethiopia, where there are several distinct tribes. They get hold of guns and spend a lot of time picking off their rivals and organising raids.

Ivory Coast has quite a few nomads, the Fulani and Twa for example.
Climate change and drought, the increasing area of the Sahara and so on have caused no end of trouble, as people compete for decent grazing.
From what I've heard, most African governments couldn't care less about their people, only their own pockets. Corruption is rife, and poverty-stricken tribes just try and fend as best they can.
Many migrate to the towns and cities. Sadly there is much prostitution and crime, not to mention disease and ignorance.
It's a sad picture.