From WordWinds link The ancient Greeks called the beast kroko-drilo, "pebble worm"
but back in the bad days.. this came up in another thread, WordWinds thread called Crocs His and Hers...
http://wordsmith.org/board/showflat.pl?Cat=&Board=animalsafari&Number=70363

the kroko piece (pebble) is an intersting root word.