I originally ID'ed this as Hemidactylus mabouia, but an African herp expert on iNaturalist convinced me otherwise.
This species is quite similar to the cosmopolitan Hemidactylus frenatus. The identities of various gecko populations in Madagascar hasn't been thoroughly studied, so this might end up being H. frenatus after all.
- Glaw, F., Vences, M. 2007. A Field Guide to the Amphibians and Reptiles of Madagascar, Third Edition
- Spawls, S., Howell, K., Hinkel, H., Menegon, M. 2018. A Field Guide to East African Reptiles, 2nd edition