He was awarded the man of the match.He was playing on secondary level (School level), he was not included in the playing 11. He went as a substitute fielder and took 7 catches and awarded man of the match award. Apart from this there is no incidence where 12th man got man of the match. :)
Jonty Rodes :
Great fielder in cricket history.
Rhodes made his Test début against India in the first Test on 13 November 1992 .