The headword is present participle, masculine accusative [in most mss, but nominative in G: see Adler's apparatus] plural, of the desiderative verb fona/w, for which cf. e.g. epsiloniota 277, phi 568. It is evidently extracted from somewhere: the quotation given, if ms G is correct (above), but otherwise somewhere else; the possibilities include Josephus, Jewish War 6.345.
[1] Aelian fr. 337 Domingo-Forasté (340 Hercher). Adler notes Valckenaer's suggestion that leo/nteion be emended to leonthdo/n 'in lion-fashion'.