Jack Frost is a leucistic line descended from the True Albino Teacher group, and it has become one of the most crossed genetics in the species. That popularity is exactly why the name alone is not very informative any more: a great many things are sold as Jack Frost, and they are not all the same line.
What this page gives you is the family laid out properly, with each cross named and each parent documented where we know it. Leucistic means reduced pigmentation rather than none at all, which on a slide shows up as a noticeably paler spore than a standard cubensis, and on paper as a lighter print.
The library carries Jack Frost itself alongside a run of documented crosses: King Cold pairs it with Thrasher, Lord Frieza with SV-10, Frosty Pearlz with Pearly Gates, and Oaxacan Frost with Maria Sabina. Each is listed with both parents.
Our lineage explorer maps these relationships visually, which is a quicker way to understand the group than reading a list of names.