Well tin whistle today are now made with nickel,brass,silver,or wood. It's not made with tin. The tin whistle is named so because before it was made with tin-plated steel.
Aluminum
Nickeloden
Tin Though called tin cans most are made from steel or aluminum alloys.
Cans were at one time indeed made of tin. However, today cans are generally not made from tin. They are made from steel or aluminium.