How to recognize a Ceratophrys cranwelli from a Ceratophrys cranwelli peppermint

[GRABibus]

Hi,

At the pet store where I bought my little ornata 3 weeks ago, I saw a Ceratophrys cranwelli peppermint. I say cranwelli peppermint because it was written on its fauna box.

It was very agressive, wanted to bite my finger when i passed it in front of its fauna box.

Question : how to recognize a Ceratophrys cranwelli from a Ceratophrys cranwelli peppermint : how to be sure ?

[Sylphie]

Peppermint is a name of a morph, because the color is blueish like peppermint green It's the same species, just different color.