Here is a pic of a new one.

It is a mongrel.

The inside. Is that a pumpkin seed? As you can tell, I'm a very new gardner:).

And last photo (promise!), the leaf. Someone said it is a mongrel. What is that exactly?

Basicly a pumpkin ( a type of squash) that is probably cross pollinated. Squash are VERY promiscuos within species and pumpkins, summer squash,and a large number of winter squash are in this group.

This looks like a Columbian squash (go by a Mexican grocery store to see one, they usually have it).

Taste it -- even if they sold you a cross pollinated plant, it may still taste good. You could try using it young (green) like you would zucchini, and once it's orange you could use it in any recipe that calls for pumpkin or winter squash. I usually taste stuff raw, and if it's passable raw, it will taste better cooked and with seasonings.

Or look up recipes for Columbian squash!