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Why might you use torpedoes made of ice? Well, because if you do you don't have to actually bring torpedoes onto the ship, all you are the warhead for the front and propulsion fuel.
That saves space, and you can make the torpedoes as you go, and reload simply by going to a greater depth where the water is colder to create the ice.
Lastly, there's another big advantage.
If you sink an enemy ship with one of your ice torpedoes, the warhead will explode, and the ice will melt, there won't be anything left over for anyone to find.
This makes forensic accident investigation nearly impossible.
Do foreign navies and militaries do forensic evidence on the ships that they own which have been sunk? Yes, as a matter fact often they recover the ships, look at the holes in the hull, and look for torpedo fragments.
Generally, they do find the evidence they need, and exactly what they're looking for.
Let me give you an example.
When North Korea sunk one of the South Korea's ships, Kim Jong Il tried to deny it, but when evidence was found of a North Korean torpedo, which was designed after a Chinese version of the exact same torpedo, in fact, it might have been a Chinese torpedo but it was fired from a North Korean submarine.
Well, that was the evidence needed for South Korea and the United States to go and do something about it, and they hosted naval war games in the area so that South Korea knew how to deal with such things as this and those types of threats in the future.
However, what if North Korea had used ice torpedoes instead? There would not have been evidence, only speculation, and that would've given the North Koreans the advantage.
That would have been good for them, and bad for us.
But as long as there is such an advantage in warfare, perhaps we should look into it and take that advantage, it adds to the fog of war, and doesn't give your enemy any proof or evidence to use against you later.
Would it be hard to design such a system, or a giant icemaker, or a 3-D printer which could cut the ice into the proper shape? No, that would be very easy, and with graphene sheets you could wrap the ice, and then coat the torpedo was some sort of bio-organic protein which would quickly eat away the carbon left behind, there wouldn't be any evidence.
Who knows, maybe in the future ice torpedoes may exist, or maybe they already do? Indeed I hope you will please consider all this and think on it.
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