Where say hello by the tongue?

You can't "say hello by the tongue" in the literal sense. We use our vocal cords and mouth to speak, and the tongue plays a role in forming the sounds.

It's possible you might be thinking of:

* A gesture: In some cultures, sticking out your tongue can be a greeting or a sign of respect.

* Body language: Your tongue can subtly convey emotions and intentions through facial expressions and gestures.

If you could clarify what you meant by "say hello by the tongue," I might be able to give you a more specific answer.