Fleet
the ships carrying emigrants were called "coffin" ships
Coffin ships were called coffin ships because lots of people died on them
Because they were ships? Do you mean longships? They were long and thin.
A ships accountant is called a "PURSER"
Some of the earliest sailing ships were merely rafts, as proven by Thor Heyerdahl with the "Kon Tiki" in 1947.
Ships crew
a number of ships is called a fleet.
A group of ships is commonly referred to as a "fleet." This term is often used to describe a collection of naval vessels or merchant ships operating together for a specific purpose. In some contexts, smaller groups may also be called a "convoy," especially when ships are traveling together for protection.
they were called Sailing Ships
Wooden sailing ships.
A Flotilla is a small fleet of ships
The prison ships in "Great Expectations" are called the "Hulks." These were decommissioned ships used as floating prisons for convicts in England during the 18th and 19th centuries.