The dyed clawed frogs are not just in China. They got them in at the pet shop in my town a couple of months ago. Baby clawed frogs about 1 inch to 1.5 inches SVL, and they were colored green, pink, etc... The green ones really looked sickly. I didn't realize at first that they were "Jelly-Bean" ACF, at least that is what they were being called, and I told the girl at the pet shop that I thought that the company sent them sickly frogs and that they would probably die on them.
I'm almost tempted to buy one, just to see how well it does. On the other hand, I don't believe in supporting dyed animals.
The color doesn't really last 3-4 years. It doesn't last with the Parrot Fish that they bring in either. There might be some color left, but it's not nearly as vibrant as when they first come in. Most of it is gone within the first month.