No empirical data exists to the best of my knowledge, but I would wager that Kenya’s most creative indigenous communities are the Kikuyu, the Somali, the Kisii and the Kamba.
The reasons are not difficult to fathom. The Kikuyu, for all practical purposes, lost their choice, fertile land to colonialists. Some were squatters in the 1930s, when other communities didn’t even know the word existed.