There is a "blonde" morph of the Mexican Hognose. Richard Evans had it years ago, produced some hets, and then apparently sold the only visual in 2004-2005 to a Japanese man that did not want to breed it.
I know where one pair of hets landed, but they never got any eggs from it. No idea where any others are. I was told that the trait was proven genetic, though.
Here is the old pic from Richard's site:
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