Chocolate Hognoses
Chocolate and Swiss Chocolate sound like the same warm brown gene but aren't, and only one of them has any breeding record behind it. Read a Chocolate-tagged listing on the photos in front of you rather than assuming Swiss Chocolate's history applies.
About the Chocolate gene
Chocolate is listed as its own western hognose trait, separate from Swiss Chocolate, the well documented recessive gene bred by Jules Toth of Black Hogs in Switzerland. The two names are easy to conflate on a fast read of a listing, but they carry no claim on each other's genetics, appearance or breeding history.
Appearance
Chocolate's appearance isn't documented on its own terms. Nothing distinguishes what it looks like from Swiss Chocolate or from any other hognose morph. What's documented under the name Swiss Chocolate is a hypermelanistic morph: a very dark brown to near-black snake with a reduced, darkened head pattern, closely resembling the Sable morph but running warmer and richer. That description is Swiss Chocolate's, not Chocolate's, and shouldn't be read onto a Chocolate-tagged listing.
Genetics
Chocolate's inheritance mode isn't documented, so it stays unstated rather than guessed. Swiss Chocolate, again the separate gene, is a documented recessive: two copies are needed to produce a visual animal, and one copy, a het, shows no visible difference. None of that inheritance information carries over to Chocolate.