Throwing weapons? No, not really. At best you have harpoons which can stick into the hull of a ship, but they're not big enough to cause any sort of structural damage. You'll need siege weapons like a balista for that, or better, a cannon.

From what Nyx pointed out to you, the bulk of the shipwreck is about thirty-feet away from the beach coast on top of various rocks and crags. From what you can tell those rocks are only barely jutting out from the waters (You'd likely be able to see them if it was low tide), and evidentially stable enough footing for the Drowned to walk around. Forty feet away from the coast itself are larger rocks and rougher waters that will be both difficult to pass and will likely kill any drowned that tries to go through it and fail to maintain their footing, which is very likely considering the drowned are still zombies and thus suffer a zombie's weakness in terms of coordination (They don't have any).

So basically the ship is somewhere about 10 or so feet from the rough rocks. I ought to make another map.