A group of boats is usually referred to as a convoy. If they are a medical group of boats it is normally called a Medical Convoy.
yes, it could be
A group of boats is a fleet.
U-boats, packs of German U-boats searching for American ships were called wolf packs
A flotilla.
Wolf pack
War boats were called triremes.
The viking boats were called tall ships
The small boats of Venice are called gondolas.
life boats
yes
A flotilla