The proper term for a post on a ship is a "Stanchion".
bollard
posts
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"
Ships crew
a number of ships is called a fleet.
Stay
Those posts are down the left field line and the right field line are called 'foul poles'.
They are called:Bollards
they were called Sailing Ships