Difference Between Amphibians and Fish

[mpmistr]

I have no doubt that ACF have some salinity tolerance of saltwater, but my question is that how can they tolerate up 40% of salinity when our ocean is about 3.5% in salinity...?

So perhaps you're saying that ACF can live in brackish water that is up to 40% of the 3.5% saltwater? Even then I suspect they can't withstand that salinity for majority of their lifetime. It's probably more of a temporary tolerance.

Yes, 40% of the 3.5% saltwater; brackish conditions. I know they've invaded brackish conditions in the wild, not sure if they can survive in it permanently though, They are quite salt tolerant -- for a frog.