A recent study reveals that Nile crocodiles respond to the distress cries of human and primate infants, highlighting a potentially universal nature in such calls and raising questions about both predatory and parental instincts., Technology & Science News, Times Now
I guess it depends on what the croc does when it finds the baby. If the crocodile tries to nurse the baby, then we know they’re just big old softies.
It would probably be tough to find volunteers to find out. Although there have been some cases of using robots to test animal behavior, for example robofinch, waggle dance robot bee, and monkeys mourn robot monkey. Also, supposedly there were [a couple girls raised by wolves](https://en.m.wikipedia.org/wiki/Amala_and_Kamala#:~:text=Amala ( c.,raised by a wolf family.).