Most males in captivity fail to see the 9 or 10 inch range. 9-10inches african bullfrogs (males) are typically seen in the wild, but are uncommon to see from a captive bred individual. That being said it is impossible. Out of my 11 CB males, I have 2 that are 8-9 inch range and still growing. I have 3-4 that are older that reached around 8 inches and stopped growing length wise.
Needless to say 9-10inch is not common.