That's a great question. Generally female frogs aren't very vocal, but may make noise when disturbed, but this is often more along the lines of a clicking sound(My experience with this comes from my toads), not very audible. Unfortunately I have only owned a male, so my experience with this specifically is limited. If the noise was low-pitch and pretty audible, it may indicate it's male. You'll find out for sure later though! Hopefully another user is 100% sure on that one!