The New Monster High Frankie Stein doll in swimsuit box toy Barbie is a collectible doll from the Monster High franchise by Mattel. This specific doll features the character Frankie Stein and comes in a swimsuit box packaging. It is a popular choice among doll collectors and fans of the Monster High series, offering a unique addition to any doll collection. The doll is made by Mattel, known for their quality and attention to detail in creating popular dolls like Barbie.