Oliver,
4 cm seems much too large for the diameter of a 20 cm
snake. Was the snakeskin intact or just a piece? If
intact, I think you probably have more than one snake.
I'm interested in your frogs. Are they terrestrial or
arboreal? Have you heard them calling? If you are
looking for an ID, a good candidate might be the
neotropical genus Eleutherodactylus.
Eleutherodactylus species have direct development
(metaphorphosis in the egg so that little froglets are
hatched) and frequently lay eggs among the leaves of
plants like bromeliads, so they are easily transported
around.
Nick
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