Toon Maker avatars conform to G5 standard .
This means you can exchange the body parts Head/hands/feets and upper and lower body with other G5`s.
You can also exchange with G5 Clone Cloth....but the underlying body will be that of a G5 Standard avatar.
That`s why, in my earlier post, I included the bath towel example. If you look carefully it`s not actually Stretchy and Chubby`s body its Chucks.
I adjusted the settings in the avatars proportions panel to try to make Chucks upper/lower body more closely match those of the Toon characters.
Hope this helps.