The original post regarded african dwarf frogs, not african clawed frogs.
Here's a basic link regarding care and maintenance of ADFs:
http://aquaticfrogs.tripod.com/id13.htmlIt's recommended to give these guys ~1 gallon per frog, so you could set up 5 in a five gallon. (Frankly, 10 gallon tanks are often cheaper to acquire than 5 gallons. Since they're more commonly sold, their prices are lower in stores, and you could probably find one on craigslist for a very reasonable price, since many people start w/ them and then upgrade to a larger size.)
One thing I might want to try is having ADF and RCS (red cherry shrimp), which would clean up the debris. It's not impossible that the rcs would get eaten, but in a well planted tank, they could cohabitate, and you wouldn't have to worry as much about leftover food polluting the water.
Good luck to you. These are very fun frogs. My only other advice is to visit the petstore to check in on these frogs a few days in a row before purchasing them. They're handled pretty roughly, and if you watch them over a few days, you'll get a better sense of their health before taking them home.
