"das" is has evolved from the contraction of two words, "de" and "as" which are "of" and "the" (pl, f). The quotation in your first post is, as far as my limited knowledge of Portuguese can attest, current-day Portuguese. I feel sure that the other one is from a more ancient form. A guess at some of the first part is that "r"'s are sometimes used instead of "l"'s. Thus, "este chamada Fror das frores" becomes, "este chamada Flor das flores" or "it is (or possibly you are) called Flower of flowers".