The white colored Pumpkin is called "Poosanikkai" in Tamil. It is a traditonal vegetable. We have been eating this and used for many other purpose (for example: medicinal effect and to remove bad spirits) for centuries.
Pumpkin pieces are used to make Pumpkin Sambar or Kootu.
Popular dish where Pumpkin is used:
As a main vegetable ingredient in Sambar or Kootu.
Spelling variations in Tamil name for Pumpkin:
Poosanikkai, Poosani kai