No they are associated with Ireland
Ireland is known as the land of the shamrock. The shamrock is a symbol of Ireland and is associated with St. Patrick's Day.
The shamrock is often associated with Ireland though it is the harp that is the official emblem of Ireland.
The shamrock.
The Republic of Ireland.
Thistles do grow in Ireland, but the thistle is most generally associated with Scotland. The plant associated with Ireland is the shamrock.
The shamrock is most commonly associated with Ireland. It is a symbol of Irish culture and is often used to represent the country, especially on St. Patrick's Day.
The three leaves on a shamrock are said to symbolize faith, hope, and love. In Christianity, the shamrock is also associated with the Holy Trinity—the Father, the Son, and the Holy Spirit.
Shamrock, Wisconsin Shamrock, West Virginia Shamrock, Virginia Shamrock, Texas Shamrock, Pennsylvania Shamrock, Oklahoma Shamrock, New York Shamrock, Colorado Shamrock, Florida Shamrock, Georgia Shamrock, Illinois Shamrock, Louisiana Shamrock, Missouri
Tom & Jerry aren't directly of even indirectly associated with any specific holiday.
The rabbit is associated with the holiday, "Easter". This is because in the spring time, many animals are born -- especially rabbits.
The phrase "ho ho ho" is traditionally associated with the holiday of Christmas.