Closeup 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. Note that this is a macro shot, here it is from a normal point of view, about the size of an average-sized leaf:

Although the photo may not suggest it, these frogs are so well camouflaged that if you look away (for example to adjust camera settings), you will have trouble finding it again even if it has not moved. Their pattern messes with your sense of depth.