1. They are at least 2 years old(1) How old are they currently?
(2) Have you heard any calling or seen any aggressive interaction between them?
My guess is that from these photos nobody can give you any confident answers.
I thought on the picture, where both frogs are seen on the glass can be told if theq are same sex or not. I will try to hear, but so far there was nothing.I would make sure the room they are in is completely silent. The call Tincs make is low pitch and low volume and almost impossible to hear outside the tank unless there is total silence in whatever room they are in.
Based on the larger heart shaped toe pads id guess male, but this is totally speculative. Hearing them call would confirm.
Thanks Mark, I think so as well. They are very identical and with big toe pads. And because there is no conflict between them, I thought they should be both male.The glass picture is excellent. I would say both males. I don't know that I have ever actually heard one of my Tincs call. It's very, very quiet.
I will keep an eye on them. I do not feed them too much, as I read somewhere, that often the frogs are overfead and too fat. I don't notice, that anyone eats less or is somehow harassed. But in the last days they do interfere a lot with each other. I am not sure if it is agression, affection or nothing And they both sleep in the same coconut hut while in the Terrarium there are 4 provided. Is that typical for two males?No problem. Just be careful and keep an eye on them. Neither look very fat and the way you will probably know there is conflict is if one or both lose weight. This can happen with two males, too.