This root form (lemma) is used in 2 different forms in the NT: ἀφρίζει (IPA3··S), ἀφρίζων (PPA·NMS).
It is glossed in 2 different ways: ‘he is foaming’, ‘foaming’.
OET MARK 9:18 Greek word=ἀφρίζει (afrizei) Morphology=IPA3··S English gloss=‘he is foaming’ SR GNT MARK 9:18 word 11
OET MARK 9:20 Greek word=ἀφρίζων (afrizōn) Morphology=PPA·NMS English gloss=‘foaming’ SR GNT MARK 9:20 word 23