Mantidactylus albofrenatus
—
Eastern Madagascar Frog

This might be Mantidactylus melanopleura instead; I think they are mostly distinguished by size. One of our guides thought it was M. albofrenatus so I'm going with that for now.
Here is a list of all the reptiles and frogs I saw on this 2023 trip to Madagascar.
Online references:
- Mantidactylus albofrenatus account on AmphibiaWeb
- Mantidactylus albofrenatus account on iNaturalist
- Mantidactylus albofrenatus account on Amphibian Species of the World
Printed references:
- Glaw, F., Vences, M. 2007. A Field Guide to the Amphibians and Reptiles of Madagascar, Third Edition