This ship is known as the Aquaraiders Reed Rammer. While not specifically designed for any purpose, it is relatively fast and is tough and good for ramming. It is often used by the Aquaraiders to break through walls by ramming into them.
This is my Minifigure Creation dedicated to the much-too-small Aquaraiders theme. It is part of my series of creations dedicated to my favorite minifigures. I think that Aquaraider makes it into my top 5 so it gets a slightly bigger creation.