Stephen said
Papias is a mighty thin reed to support all this baggage.  He is reliable when we need him to be but a goofball otherwise. I do wish we had his book.

  

I also wouldn’t hang anything on papias say so. 

I fell asleep watching tabor speak on this a couple of nights ago, and I think he was speaking specifically of an actual text of Matthew in Hebrew that has survived and that does not appear to be a translation from Greek. I believe it is preserved in a medieval (14th cent?) Jewish refutation that quotes the Hebrew Matthew extensively. 

I don’t think tabor mentions it, but here are also some apparent word plays in Greek Matthew that only make sense in Hebrew or Aramaic–thise give me pause.