Finding the parents was not necessary as the tadpoles are 'on their own' and best if left right where they were. ( IMO)
There in NO reason to intervene. The frogs know what they are doing.......we could never replace the instinctive decisions necessary
for them to survive and do their part in procreating and mainlining the species. In fact, some of the tadpoles may be 'food'.
Removing ,even a few, could cause the demise of the rest