Fountain pen tip use for dip pen?
No. As there is no place for the fountain pen tip to hold a reservoir of ink through dipping. 

A dip pen has a slight concave curvature. This curvature helps to hold, with the help of the surface tension of the ink, a small supply of ink on the backside of the nib.

As you draw the dip pen across the surface of the paper the tip of the pen deposits a small amount of ink onto the surface of the paper. The surface tension of the ink and gravity pull more ink from the supply as the pen is dragged along the surface of the paper.

With the fountain pen there is usually a plastic tunnel at the rear of the pen nib which is the tube through which ink in the storage cartridge is supplied to the pen tip. There is no room for the fountain pen tip to stored any usable amount of ink. Dipping the fountain pen into a pot of ink will cause a glob of ink to form at the tip.

If you really really want to try it then have a cloth handy. After dipping the fountain pen into the ink pot wipe the convex surface of the fountain pen tip after dipping. The nib will have a bead of ink on it. And you want to get rid of this bead before touching the tip to the surface of your paper. After wipping the drip away. There will be a small amount of ink that will remain on the exposed concave surface at the back of the pen. All depends on how far the plastic tunnel covers the back of your fountain pen nib. It will be a small supply of ink but maybe it will be enough for you to try. You will have to dip and wipe often as the ink will run out quickly.