well... the directors did the voices for the minions. they are french. but yes... you're right, they also made up the minion language from a mix of other languages. but it seems like most of it is the french version of other phrases. and i guess there are a lot of food references. lol
"In providing the voice of the Minions, Coffin[one of the directors] uses words from languages including French, English, Spanish and Italian. —There are a lot of food references,?? Renaud added. —For example, —poulet tiki masala?? is French for the Indian chicken dish.??
And I love that they are essentially little french men...