double het

Nope, you can breed two double hets and get a double visual.

So, if you cross AaPp x AaPp you can get

aapp (Normal)
Aapp (het albino)
aaPp (het Pied)
AaPa (Double het albino pied)
AApp (Albino)
AAPp (Albino het pied)
aaPP (Pied)
AaPP (Pied het albino)
AAPP (Albino pied)

copy pasted from my ball python genetic calcualtor

Male = het. Albino, het. Piebald
Female = het. Albino

Offspring predicted as:

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75.00% Normal(66% poss. het. Albino, 50% poss. het. Piebald)
25.00% Albino (50% poss. het. Piebald)