What about axanthic albino?
'The second kind of albino I will mention is the axanthic albino. It has normal pigment cell migration but is homozygous for the albino gene and the axanthic gene (a/a and ax/ax), meaning it lacks melanophores, xanthophores and iridophores. It is almost white, but becomes yellow with age due to the accumulation of riboflavins from its diet.' (Axolotl.org).
But do axanthics get freckles? 0.o
Ooh, actually, reading further down, it is actually possible to get yellow leucistics: 'Axolotls come in many different colour variations. Axolotl breeders often produce an odd offspring whose phenotype defies what the breeder knows to be its genotype.
Piebald axolotls (not just on the top of the body like a leucistic), yellow leucistics with black spots, and the harlequin (orange and black patches on a white axolotl) are just a few examples of what chance can present.'
Also, a melanoid albino isn't out of the question - melanoid albinos have the gene for yellow xanthophores...but it does say on the site that the yellow tends to be limited to the head and back, and in small quantities...this bubby has quite a bit of yellow going on there

I'd say yellow leucistic personally.