The Detroit Lions are a pro football team, and thus in neither of these baseball leagues. The Lions are in the National Football Conference of the NFL.
Not professionally. There were two professional leagues in 1947, the National Football League and the All American Football Conference. Neither league had a team in St. Louis in 1947.
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there are no nickname's for any national football team
Seattle Seahawks are a football team in the National Football League.
Israel national football team was created in 1928.
Scotland national football team was created in 1872.
Wales national football team was created in 1876.
Palestine national football team was created in 1928.
Peru national football team was created in 1927.
Libya national football team was created in 1918.
Serbia national football team was created in 1414.