Pristimantis lanthanites Striped-throated Rain Frog
Some other names for this species:
Metallic Robber Frog
Santa Cruz Forest Reserve, Loreto, PeruJanuary 19, 2014
Striped-throated Rain Frog (Pristimantis lanthanites) Striped-throated Rain Frog (Pristimantis lanthanites)
This does not look like a comfortable leaf upon which to perch. But I guess Amazonian frogs are tough.

Here is a complete list of the herps I saw in the wild on my 2014 MT Amazon Expeditions trip.

Online references:
Printed references: