 Frank was selected by the Dallas Cowboys in the 18th round (244th overall) of the 1963 NFL Draft and the San Diego Chargers in the 24th round (186th overall) of the 1963 AFL Draft.Because he still was under contract in the Canadian Football League, the Cowboys had to additionally trade running back Amos Bullocks to the BC Lions in exchange for Frank's playing rights.To complicate matters further, he signed a contract with the San Diego Chargers of the American Football League, who selected him in the 24th round (186th overall) of the 1963 AFL Draft.