A new lineup of nesting pony dolls has been announced by a company called PPW Toys. Browsing their website, they seem to specialize in making these, especially with Hasbro brands.
The tallest of the set is 4.5", with the smallest being 1 1/4". You get a front and a back as you can see in the images.
Expect them to release in January of 2017! You can pre-order the set over here.
