Robert Irwin had a scary moment with a crocodile but lived to tell the tale. During a recent appearance on “The Tonight Show starring Jimmy Fallon,” the 22-year-old conservationist shared he was “death rolled” by a 14-foot crocodile he named Jimmy Fallon when it was a baby. “He’s not a baby anymore. I named this crocodile Jimmy Fallon, like, years ago, and he’s now what we call a boss croc. He’s huge,” Robert said. “Because we research crocodiles in the wild to, like, better conserve them, right? So the way you do that — my dad came up with this — is you actually have to jump on them.” The Australian conservationist told the talk show host that after he “jumped on the back of Jimmy Fallon,” the large reptile “death rolled” him. “I jumped onto him. I kid you not, 14 foot of crocodile, big croc, death rolls me,” he explained. “So I’m stuck underneath him with my arm hanging out. I’ve got like probably, I don’t know, maybe 700 pounds on top of me.…