Is there an Apple app to say what you want to text?

I'm tired of saying my text message. Andriod phones give them a mic to say what they want to text. I don't have an iPhone but the iPod touch 4g i need a mic that would do the same thing as the android phones!

Added (1). I kno their is a mic next to my camera and my ipod doesn't have a mic with the keyboard that's my problem

Siri already does that.

You just hit the little microphone button on the default keyboard and start talking. The 4th Gen Touch already has a microphone next to the front camera.