I have grown Fresca from seed, as well as other varieties. Fresca most certainly is NOT an alpine (F. vesca), or even a cross, because such crosses are difficult to make and don't produce OP seeds.
(I do have a Fragaria x vescana as well, that was a plant I purchased from a German speciality garden store)
Fresca seems to adapt well and either produce large vigorous bushes or also tiny more modest growth, depending on the soil and location.
It is an everbearing, meaning that it flowers all summer long. The fruits are pretty (and) sweet.
I certainly haven't looked it through a microscope lense, but given that Fresca seeds are widely in distribution and relatively inexpensive, I don't believe it can be a cross.
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