I am also fairly certain that you have an African Giant and not a Dwarf variety. It can sometimes take a while for the vertical stripe to fade, so I would not use that as a determining factor for sexing. If you heard any sort of sound from it, then it would rule out it being female. Based on your pics-the colouring and size-I am leaning towards male. Most females I have seen have not exceeded 4" long. John would be the best to confirm what we have said. Very nice looking frog!