Some morphs like bastimentos or cayo de aqua are somewhat more tolerant to eachother.
Others will start fighting the moment they see eachother,
If you choose to house them together, make sure to have a spare terrarium in wich you can put them apart whenever things go wrong and you're in time.

There is also a difference in how bold they are, for example, bastimentos will be in plain sight a lot, but cauchero lives more secretive.
Altough there are some individuals that are different from the rest

Pumilio's tend to get real aggressive, even drowning much larger frogs like tinctorius.
Even in a large terrarium, space is limited in comparison to the natural environment,
keep that in mind.

If you can't look at them closely before purchasing or aren't sure of you're sexing luck, you need to have multiple terrariums,
As soon as you see one calling, normally this is the most dominant male, males that are not submisive will instantly call back and they'll start a fight,
others will be submisive in the hope to be left alone.

As soon as you seperated the male(s) from the group, the submisive males will become confident enough to start calling when mature enough.
Keep putting males apart untill you don't see any calling within a month,
you are now 90% sure the ones left in the silent terrarium are the females.

From here, you can try and put some males and females together in couples,
you have to see if their is any potential in this match, just like people, not all the frogs wan't to have babies with eachother
If nothing happens for a couple of months, try switching some.

It takes some effort, but it is the best way to get yourself a breeding couple or couples.