These photos have been identified here and elsewhere as various different Lygodactylus species, but now it seems the ID has become clear. The species L. tsavoensis was only recently described, but is a perfect match for both appearance and location. Thanks to @donchelu on iNaturalist for making this identification.
- Spawls, S., Howell, K., Hinkel, H., Menegon, M. 2018. A Field Guide to East African Reptiles, 2nd edition