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My first guess would be the winter squash Red Warty Thing

Here is a link that might be useful: Red Warty Thing

That is typically what happens when a ornamental gourd is crossed with a pumpkin. I've only ever seen one company market these seeds. When you grow the seeds of a pumpkin crossed with a gourd this is typically what you will see with varying amount of warts, sometimes you see some green color or stripes as well. Also another interesting feature is that more often than not these "pumpkins" will actually dry like the gourds they were crossed with.

Siegers is the company that sells these seeds. Look for 'Goose bumps' and 'Knuckle head'

Interesting. We bought it at a pumpkin farm last fall and I saved the seeds. It does look like Goose Bumps or Knuckle Head. ACtually, those two pumpkins look identical. What's the difference between them? Just the size?

I am sure there is no real difference, but on their website yes they are different sizes. I see pumpkins like that all the time in pick-your-own pumpkin patches. I like them, I think they are neat. I also have saved the seeds from these warty pumpkins, but the offspring weren't necessarily identical (as expected). One I grew this past year was slightly pinkish and had some pale vertical lines, but it was still about the same size and warty. They last forever too, I still have mine sitting on a table, it isn't drying or anything.

I am sure that 99% of the time when you see these pumpkins they weren't grown intentionally (or bought at Siegers) and were the result of a pumpkin, gourd cross in the previous season. I find it amusing all the hype that Siegers is giving these pumpkins. They have them on their main page talking about how new and unusual they are, but they have been around as long as I can remember.