Gephyromantis silvanus were frequently encountered at night on moss-covered rocks near streams and waterfalls close to camp on Nosy Mangabe.
Gephyromantis luteus were abundant and noisy at night on Nosy Mangabe.
A number of individuals found at night along streams in Farankaraina, often perched on leaves ~1 meter or less above ground or on mossy rocks.
Gephyromantis leucomaculatus found at night near a stream in Farankaraina.
Gephyromantis luteus found at night next to a stream near the dam close to camp at Farankaraina.
Gephyromantis malagasius seems to be the frog in this group that lives in the Masoala peninsula and looks the most like this. But I haven't seen any other photos of frogs quite this lumpy or with the black color above the eyes, so maybe it's something else?
I haven't seen this two-toned pattern described or pictured for G. luteus, but this specimen otherwise seems to match the description of that species.