Well let me say beforehand since you haven't kept either of these species on thier own individually I wouldn't recommend starting a mixed viv with them.
I'd have many many really logical reasons for saying that but I digress
My word to the wise is to keep them individually for a little while. Personally there is no way I would introduce a new frog into an established tank (meaning any frog including adding a new GTF to a GTF only tank for example) because from experience I know they need to be quarantined for at aleast 60 days. New frogs have to be dewormed and treated for chytrid.
I have no previous experience with clowns so I can't help you there. Tiger legs have similar care to RETF's. Again it's really important to know how each species behaves individually and on thier own before mixing them. You won't see the warning signs the frogs are sending unless you know what to look for.
If you want to be really wreckless

and just throw them in together and see what happens then don't expect too much. Not really the way I would do it, though. That's my take on it...
You could try your best to match the recommended temps and humidity levels then see if they can survive together.
Any help I can give, I'll try.