Misc: What is switching letters (e.g saying jag of flapan instead of flag of japan)?

Questions

Trivia : Who was the main character in J.R.R Tolkiens "The Hobbit"?

Trivia : Who or what is the Pink Panther, in the film of the same name?

Trivia : In what sport would a lure be used?

Trivia : Polo consists of 8 periods called what?

Trivia : Which was the first city to open a length of underground railway?