Iwear a rosy hat, but have no head, i'm sharp but have no brain, i can say anything, but never speak a word.
what am i?

A pencil.

The riddle uses metaphors in order to convey an idea. The rosy hat refers to the eraser that pencils often have on one end, and which is typically pink. The object is sharp, as the lead of the pencil is after it has been sharpened. Finally, although the pencil cannot "say" anything, it is used to write, which means that you can say anything you want with it.

answer; ( action training environment;