In the Mishnah, Seder Teharot, Mesechet Calim, in 8:3, talking about an oven, it states:
ואין לה גפים,
It doesn't have גפים, which K'hati explains to mean
These are ears.
And we know it has a mouth, otherwise how would it talk to the water in the next mishna?
...הרי זה אומר: מטמאיך
The oven is talking to the water, saying that the water made it tamay. So obviously it has a mouth.
And, in the beginning of mishna ז, it says:
...השרץ שנמצא בעין של תנור
This translates to
The Sheretz that is found in the eye of the oven... (My own translation)
So we know it has no ears, yes mouth, and yes one eye. Does it have another eye and a nose?