The three letters I am made up of bear a resemblance to my real life appearance, but only in their lowercase form.

Brush my teeth with grease and oil, not water and paste Put me with my brethren; teeth touching, a few at a time, to move giants We grind our teeth endlessly, so your machines may live

Cloven, clever piper, Eponym to freezing shock, A name long cast in iron, Fits well among the flock

Thin and gravely, that’s my name The gravely part might give you pain

I have a body, a neck, and nuts. I produce great sound too.