Hello Aidan,

Photos of your (litoria-infrafrenata ) will be necessary.
Include some details about the frog.....ie age etc.
If you have 2- try to include a photo of both together

I'm assuming you have not heard any calling ?
Naturally, a call is a sign you have a male.
Females are always larger .

http://www.frogforum.net/tree-frogs/...tree-frog.html

White-lipped Tree Frog (Litoria infrafrenata)

BTW--- Welcome to Frog Forum