Have you ever kept discus? They are a very high maintenance fish and I do not recommend them AT ALL with ACF. Their temperature requirements is only the first of many reasons why they won't work. They are also very shy/skittish and a big boisterous frog bouncing around will not work with them.

The long flowing fins of the angels will be all too tempting for the frogs and you do not want to see a frog latched on and being dragged around by a distressed angel.

Your best bet is to dedicate the tank to the frogs. Fish is hit and miss even with those who have been keeping both for a long time.

Goldfish *can* work but you have to buy a goldfish larger than your frogs so it is always too large to eat. Also, only buy a "fancy" (double tail fin instead of the single tail fin) so that it is not going to out grow your tank. I say this as only a last resort if you truly want fish but I recommend doing extensive research as there are many types of fancy goldfish and you have to make sure you can meet their requirements as well as the frogs harmonious. Goldfish, even the smallest of fancies, will grow 8+ inches and live many many years so this is going to be a large commitment. It will also reduce the amount of frogs you can keep (if planning 7-8 frogs, take out 2 frogs for each goldfish).