Well it is hard to see from the photo in that listing as the flash distorted the true nature of the color. Having fished a lot of Wiggle Warts in the past, and I don't recall this one having a 'pearl' finish to the green, but the photo below makes me think, hmm perhaps. So I'd get metallic/pearl out of the equation for the green and go with a white base / primer (if you know it is pearled for sure add pearl white/light silver pearl over the base coat, I have looked at other sites and still can't tell if the base is pearled) followed by a light green (perhaps a thinned olive green) of some sort and use very light layers to create the overall look and then just finish the center of the back with multiple passes of the same color until you get the darkness you desire.
One looks to me like a pearl base and one doesn't but they are supposed to both be V38