can i carve last year's pumpkins from Uncarved Pumpkins?

That's from Morostide 2013.

what about the Rreign Carved Pumpkin, Grinning Carved Pumpkin and RIP Carved Pumpkin? or should i rather buy the ones i still need ? i got all the ones i need in a wishlist

you need to carve a [item2=Pumpkin on the Vine] for the rreign one I believe. [EDIT]

just checked subeta lodge RIP Carved Pumpkin & Grinning Carved Pumpkin=Randomly obtained from carving a Fresh Pumpkin, Carving Pumpkin or Freshly Picked Pumpkin Rreign Carved Pumpkin =Randomly obtained from carving a Pumpkin on the Vine

so each year its different kind of pumpkins?

Yep. although some of the earlier pumpkins can be carved from more than one years raw pumpkin type. See my edit above.

it used to be each pumpkinkind generated only one years' carves. Over time shortages or perceived shortages of some of them resulted in users complaining, and excesses and perceived excesses of some of them resulted in users complaining. This is why they re-coded some to generate more than one year and didn't re-code others.

Since TPTB seem to be interested in being malleable, if you want certain carves you might get what you want cheaper or easier by waiting or Suggesting that a more common pumpkin blank get more possible results.

hey i manage to get the blank pumpkins ... thanks.. i just have to buy and carve them now ... i want to get one of my collections up to date before the end of the year