One pumpkin sold as Japanese Pie is also called Nippon Island.

Here is a link that might be useful: Japanese Pie Pumpkin

Thanks so much. I'll have to take a look at the actual seeds and see if that's it. I have not been able to track down a Japanese Pie pumpkin that's a C. Pepo on the internet. Maybe they're labeled wrong?

I don't know of any C. pepo associated with Japan. There are a couple of C. moschatas including one named Jap. Some folks refer to the C. maxima Kabocha types as Japanese pumpkins. Once you grow it out, you will know for sure.

I took a look at the seeds today. It's definitely not the Nippon Island pumpkin, which is too bad. I think I'm going to have to put that on my wish list.

So I guess I'll be growing a little mystery.