Don't know if this is what you mean, but several Barbies have prosthetic legs:

https://www.amazon.com/Barbie-FXL54-Fashionistas-Doll-121/dp/B07MZD75C8

https://www.amazon.com/-/es/Fashionistas-torcidas-prótesis-estampado-estrella/dp/B07ZPQPGV4/

https://shop.mattel.com/products/barbie-fashionistas-doll-189-hbv21

https://shop.mattel.com/products/barbie-interior-designer-doll-hcn12

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And G3 Monster High Frankie Stein also has a prosthetic leg

https://shop.mattel.com/products/monster-high-frankie-doll-hhk53