
Habitat shot of Mantidactylus luteus in Nosy Mongabe, Madagascar
It's taking me at least an hour per frog species to even find a species candidate, still an interesting category of wildlife to learn about. I've based this identification on this reference image:
http://www.wildherps.com/species/M.luteus.html
Furthermore, there is the pointy "snout" and ridges on its back which seem to match, as well as the distribution. I could still be wrong though, so feel free to challenge the identification. Closeup:

''Mantidactylus luteus'' is a species of frog in the Mantellidae family. It is endemic to Madagascar. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.