Check out this picture from above the tank:
While it's sort of difficult to see, the amphibian on the left has all four legs. The one on the top has just back legs, and those little bumps from its sides are front legs still tethered with the transparent skin covering they've had since hatching. The one on the bottom has its back legs just beginning to form underneath its body. There are still one or two in the tank with no signs of developing appendages yet.
We will be releasing the frogs/toads individually when they are fully formed with no remaining tail, and by the looks of things that may be as soon as two days from now. I'm actually very happy that they have developed at different rates because that gives us more time to watch them before they're all released. I'm guessing we'll only have them another two weeks at most.