The headword actually presents two words (related to chi 225) that differ only in having different adjectival endings: ἀγκυλοχείλης and ἀγκυλόχειλος ; LSJ only documents the existence of the former.
[1] From the scholia to Aristophanes, Knights 197 (web address 1 below), where an adjective variously transmitted as ἀγκυλοχείλης or ἀγκυλοχήλης ('crooked clawed', from chi 276) is applied to Cleon (kappa 1731). The latter is what modern editors rightly print, but note that in late Greek the two words would have been homophones. See LSJ at ἀγκυλοχήλης (web address 2).