Going back to the original post it sounds like a lot is being done for the frogs which is commendable.
There'll always be plenty of non survivers which is why the frogs produce so much spawn.
We had probably 2000+ tadpoles - some are still in the 'tadder' stage and 100s of 'froglets' are now knocking about all over the garden. The blackbirds love a bit of tasty tadpole and frog but our favourite frog feaster at the moment is a young hedgehog who will probably survive because of the extra food that's there.
Then - if I mow the lawn I have to shut off about how many will be cut down before their prime - although (soft s.d me) I have been setting the blade a bit higher
I'm sure all will be well if you've read up on how to make a pond wildlife friendly and followed some of the advice here.
Acherontia