I managed to get another couple of pics.

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Here is the female hiding away from the males attention, maybe she has a headache.

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And here is the third male and the eggs he is guarding inside a 35mm film canister wrapped in black insulation tape as I didn't have a black canister at the time.

It seems in my case that they prefer to use film canisters rather than leaves, and black ones over the white/clear ones (I know this is a "clear" one, but it is wrapped in black tape). This is just in my experience and my frogs, I have no idea if it is in general though. Maybe mine prefer it to be darker where they lay them, I don't know with any certainty.