hello! i don't know much about african dwarf frogs in particular, but i believe some things you can look for on your frog are "post axillary subdermal glands", which look like a light-colored pimple behind each armpit, and a cloaca, which looks like a small bumb between the legs. the glands would indicate the frog being male and the cloaca would be female, according to this website. the main way you can tell the sex of a frog is by listening for a call! only males sing to attract a mate. an adf call sounds like a squeaky, soft buzz or hum. males also tend to be smaller and skinnier than females. i hope this helped- good luck in your frog endeavors!!! i like your osomatsu-san avatar.