Partially Changing a Player's Appearance

I would like to know how I can change some of a player’s appearance. I would like their head to be put on this body:


This is a comparison of the body’s size to a normal character size. The torso’s size is 6, 6, 3.

I would also like the head to remain a normal head size. How can I do this?

Not 100% sure is what you need but you can use a Custom Humanoid Description

I would like to place the player’s head on that body. Sorry if I wasn’t specific enough, and I’m not sure if a HumanoidDescription would work very well.

here. I know there is a better way but this is my way