Fantasy frogs are a mix of the corunta(very hard to keep) and the Cranwelli(mostly). They are bred to look pretty and eat better than the full corunta(surinam) but like all children they can take after one parent or the other. They are also infertile, so no breeding a fantasy to a fantasy. This fact could have some unexpected effects on the rest of the frog. People never consider the genetics when breeding any animal, price is based on color, not health. The gene the controls hair also controls teeth, the gene the controls leg length controls the heart strength. it could have been a side-effect of breeding these infertile frogs for the sole basis of getting a prettier, more pricey frog.