Wood frogs are primarily terrestrial and do not need a large water source (unless you plan on breeding them - but remain terrestrial most of the season). Also these frogs are rather small and I would recommend 5 gallons per frog at minimum. I would just try to make an environment that mimics woodland, which is where these frogs spend most of their time. So I would go with some leaf litter, soil, some live moss, a shallow water dish, and a few live plants to offer for hiding places. Hope this helps!