It is possible that he could have been a real pirate but there are no records?
Nothing. You can see the pirate treasure flag there, but there is nothing to do. Once you have the largest warship, and have used it to beat Captain Crawfish, go back to the governor, who will give you the directions to the buried treasure.
Sail anywhere near the new island or the Pirate Outpost and he will eventually find you and attack.
Once you have all 5 map pieces, one from each island, the small island appears near the Pirate Outpost. This is where Captain Crawfish generally appears even before the island becomes visible, but you can sneak in and dock rather easily. There is, however, nothing to do there until after you have beaten Captain Crawfish and gotten the treasure location from the Governor.
When you have all of the map pieces from the 5 trading islands, the 6th island (Skullduggery) appears near the Pirate Outpost. You cannot do anything there until you have beaten Captain Crawfish. This will require the largest ship, the Phoenix Warbird, as well as hiring the Shipwright and Cannoneer. Once you have beaten Captain Crawfish, go to see the governor and he will give you the directions to the buried treasure on the hidden island.
There is nothing to be found on the hidden island (Skullduggery) until after you beat Captain Crawfish. After you defeat Captain Crawfish, the governor gives you a treasure location and a bone shovel. Sail to the hidden island. You will find the treasure under a mound, six paces right from the pirate flag.
You need to buy larger ships as you can afford them, and accumulate enough doubloons to buy a Phoenix Warbird (500,000 and you can borrow another 500,000 from the Golden Harbor bank. You should also hire the Shipwright (Dragon Cove) and Cannoneer (Pirate Outpost). When you have assembled the 5 map pieces, and have your Phoenix Warbird, you can sail near the Pirate Outpost and Captain Crawfish will eventually show up.
Generally, sailing anywhere near the Pirate Outpost will bring him out. When you have all 5 map pieces and the new island appears, sail past that island and Captain Crawfish will soon attack. You will need the Phoenix Warbird, the Cannoneer and likely the Shipwright to best him in battle.
Find the 5 pieces of the map and examine it and you'll see where skullduggery is. Dock there then get out of there and you'll find captain crawfish
Scurvy Sam isn't a person you need to find on Poptropica. It is just a name said by the female pirate (one of Captain Crawfish's crew) inside Petey's Pub.
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The duration of Captain Pirate is 1.42 hours.