As an aussie you should know ,
altough it is a foreign species, what might occur when introducing frogs somewhere they initially don't belong.
The Rhinella marina is an extreme example ofcourse, but they do point out what misguided actions can lead to.
Speaking of adaptable species
Normally most of the tadpoles would be eaten away, by catching lots of tadpoles, the predators of the tadpoles will suffer from it.
When putting back froglets, chances are they will decimate the amount of bugs available and so on.
Seemingly small adjustments might just wreck an entire system.
Always think carefully about what you are doing when it comes to fiddling with the chain around you,
it's great when people show interest in herping, but do it with responsibility.