Which African Bullfrog grow larger? male or female?

[lovenokia]

thanks, since I am about to get a african bullfrog, how do you get these frogs in the 8 to 10 inch range? It says they can be from 4.5 inch to 10 inches, but what is the reason that they vary so much in size?

[Wicked frogs]

Honestly i have never seen a GIANT pixie frog full grown at 4.5 inches i think i might just be impossible unless maybe malnourished maybe they are talking about dwarf pixies cause i have a dwarf M/pixie and he is just about full grown at 5 inches but hey a little research from google this site and many other sites might just help.