Polly Pocket Trolls

Polly Pocket is a girls' toy range focusing on the character "Polly Pocket" and is owned by Mattel. 
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The toys are designed as a locket or make up compact with a doll inside. The inside of the compact or locket was decked up in a scene, making it a play set. Originally, the playset was designed to fit inside a pocket, hence the main characters name of "Pocket". Originally they fulfilled this size requirement, though the playsets have varied in size since their initial introduction. The doll itself inside the compact or locket also varies in size depending on which version of the franchise, the initial released figurines in the 1990s were only a few cms tall and was entirely made of plastic. However, later the figurines were swapped for miniature dolls with cotton hair.
Each version of the franchise is compactable within its own generation with all toys in the range. So all dolls and playsets in that version of the franchise are capable of being used together. However, this is not the case between generations, for example, the original generation is completely incompatible with all modern versions.
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PPPMTBT.jpg|Polly Pocket playset for Trolls Band Together