Who was Indian Joe?

If you mean 'Injun Joe' - he was a character in Mark Twain's 'Tom Sawyer'

From the excellent 'Mark Twain A to Z' by R. Kent Rasmussen,

'Mark Twain took Injun Joe's name from a Hannibal resident about two years older than himself whose real name may have been Joe Douglas... Mark Twain's Autobiography claims that the real Injun Joe once subsisted on bats while lost in the cave. He died a respected citizen in 1925.'

Injun Joe doesn't appear in any Twain fiction other than 'Adventures of Tom Sawyer,' but he is mentioned in Twain's essay 'Is Shakespeare Dead?'

http://www.ipoet.com/archive/spadaro/clayton/joe.html for one who is still living