Why are you going there? It has nothing to do with "Ethics"!
You people would love to put more cost and larger quarters for the frog when it just isn't necessary. Frogs don't have the same requirements as Humans or Fish. They do not need as much room period.
The Frog will be just as happy in 6.6 gallons as 10! I've seen Pac-Man frogs live in their entire life and grow to 8" across in a standard 5 gallon bucket.