Totally? Well put it this way, you cant suit me, if its not!

But I think so, yes. Ofcourse, be sensible about it, observe your frogs for a few days, if they hide from it, assume its not good, to be on the safe side.
You dont specify what kind they are, some are nocturnal, these shouldnt require Uv, if they are diurnal they will get some via patches of sunlight that reach the forest floor,
but it would be filtered and much absorbed by canopy froliage, so what they get, given they dont spend much time in direct sun, lest they dry out, would be minimal.
Try to make sure they can escape from it if they want to, even if they are diurnal.