In the News post Jaxon says you can find Pumpkin on the Vines floating, but I haven't found any this year, only Uncarved Pumpkins

Is this a typo, or are they especially rare?

It's a typo. Last year it was Pumpkin on the Vines. This year is Uncarved Pumpkins. It should say that instead of Pumpkin on the Vines.

Yeah it is just a news typo. The uncarved are the new ones.