Why is a newcomer called a “rookie”?

I'm sure we should look this up, but it is fun to speculate. A previous response mentioned the connection to the root word "rook", which was my understanding, but for a different reason. The Rook in chess is an important, but usually late player on the chess board. Since the Pawn gives background to both the noun and verb modern usages of "pawn", Rook to "rookie" is not that much of a stretch. Until proven inaccurate, I hope to remain, cordially yours, regards.

Did a small research to find out the origin of the word rookie... Though its not sure where the word came from, its most likely that it originated from the word 'rook' which means a simpleton or a fool... In most sports rookies must do things or tricks are played on them....

I really dont know why its called as rookie there must be some story behind this why a new comer is called as rookie... but thats a really good question You have asked...!