barbarolexis
From LSJ
εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses
Latin > English (Lewis & Short)
barbărŏlexis: eos, f., = βαρβαρόλεξις,
I the perversion of the form of a word, esp. the change or in flection of a Greek word according to Latin usage (while barbarismus is the erroneous pronunciation of a Latin word), Isid. Orig. 1, 31, 2 (in Charis. p. 237 P. used as Greek).