Interested to learn more as well. I’ve seen some videos of certain mantellas laying eggs in a dry marsh that is known to flood. I’m curious to learn as well - I’m a total noon to frogs but hopefully get mantellas soon.
No. Tadpoles are laid by streams and flushed out by heavy rain. In captivity, what to do is once you find an egg clutch, cover it back up until the tadpoles have fully developed and the jellymass breaks down. Disturbing the eggs too soon and exposing them to light will likely make them go bad / mold. Then get a spoon and scoop them out and put in a tadpole tank.