I've never understood why giant snakes and lizards have existed in the myths and folklore of so many cultures when it's clear the scariest fucking thing ever would obviously be a huge frog.
The first time I had frog, that's exactly how I described it. After that I just ate the shit out of it and didn't tell nobody nothin'. More frog for me, losers.
ps. They don't really have immune systems but they produce peptides that attack bacteria and prevent it from reproducing. That will probably lead to something doctors will use a lot in 20 years.