let me start with the easy question. you should not keep the adult whites that you friend wants to give with the other species until they are larger because the whites are very aggressive feeders and will try to eat anything that moves that is smaller than them. which also means that the smaller whites will get bigger and try to do the same thing, so he should be seperated as well, but not with the bigger whites which may try to eat him if the size difference is big enough. golds treefrog, which i'm going to take as a golden treefrog, since i have never heard of a golds before, is also a relativly large treefrog as an adult and woould be capable of attemping to eat some of the tank mates. he should be able to be kept with the small whites, and should be able to go in with the adult whites once he is large enough, a long with the small whites once it grows larger.
the red eyed treefrog requires a much warmer and more humid setup than the others do and while the whites and golden could live in such an enviroment, the red-eye does stay small enough as an adult that it could still be prayed upon by a large whites treefrog. the red eyed treefrog could be kept in the same setup as the dart frog since they reqiure a similar habitat setup (just make sure the red eyed has plants to hide on). the dart frogs loose their toxins once in captivity and the red eyed won't make an attempt o the dart life, so they should be fine together.
as for the firebelly, i know that some small species of treefrogs and some species of newts work just fine with firebelly toads, but you have known of these species. firebelly newts and oregon newts have worked well with firebelly toads before, but i would not put sals in.
you could try yellow spotted or marbled sals with the golden, but make sure they are adults (4" ) if going in with the whites.

hope this helps and i am a firm beliver in mixed species tanks, i have many myself, as long as they are done right.

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