Correct spelling for the English word "Frequantage" is [fɹˈiːkwantɪd͡ʒ], [fɹˈiːkwantɪdʒ], [f_ɹ_ˈiː_k_w_a_n_t_ɪ_dʒ] (IPA phonetic alphabet).
Frequantage is a neologism that does not currently exist in the English lexicon. Hence, there is no standard dictionary definition for this term.