people have been chasing a croc in the gulf of papua for a few years now. its 2m across the back legs (measured from prints in the mud) which puts it in the 6-8m long category. till they get a hold of it and we see some pics its all just guesswork. no doubt, like the croc in the story its a monster.
probably similar stories in North Oz as well.
I was having a couple beers at the marina in Townsville with a couple locals last week, when they were telling me there have been a lot of croc sightings here. 15 mins later an Asian in a swimming cap swims across the marina. Gotta love Asians!