Ive never heard of them either!! Is this what you are talking about?
I found them to be aka peanut squash, sweet potato squash, and Cucurbita pepo; but I didn't find any info in the USDA database using those names either. I found that it is an heirloom variety. The food network encyclopedia says they are good sources of potassium, iron and vitamins A and C.
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I just gave Will a Tatuma winter squash. He loved it! I was only going to give him a half, but the first half disappeared so quickly, I gave him the other half which he ate as quickly as I could scoop it out.