[Mobhack]

Yes, this game is land warfare and not naval.

Now - one could make a scenario and tweak some existing boat (size zero say) and set it at night as a harbour attack and lad the boat with an explosives class weapon like a suicide truck bomb. Human would lkely need to play the boat side as the AI would have absolutely no clue what to do. But that is a sub-niche interest scenario and likely not particularly interesting to play, really.

But its not going to make an appearance on any OOB as it is so ultra-niche as to be useless and a waste of a unit slot, and a formation to hold it as well. Roll your own using the scenario editor if it is needed for the sort of scenario I just suggested.