Aquariums and Fish Keeping

It doesn't look like a particularly high-quality aquarium set, but all the necessary parts seem to be there. Even before getting this thing, I've thought about keeping dwarf frogs. Would a 5-gal. tank be big enough for two or three of them? If not, what would you suggest? I've kept aquariums before, but it's been a very long time and I know myself well enough to know that I need something relatively low-maintenance.