Dear Mary Jo
according to the North Tipperary records on RootsIreland there is a marriage in Lorrha RC parish between Jane Carroll and John Stanley in 1842.
If John was indeed from Borrisokane, the RC records only start in 1821 and his baptism is likely to have taken place before then so you probably would not find the baptism.
In fact there are no baptism in the database for children born with parents William and Mary Hogan.
If John Stanley was not from the parish, it is possible that the original record would mention his parish of origin. You should look it up.