Seems like a lot of information on pumpkin sales as fund raiser for schoolhouses past and present. I know of no variety named school house.

I've never heard of a school house pumpkin either. However there is a variety called 'Schooltime', I'm not 100% sure where it got it's name other than kids are said to love them. Though honestly kids are pretty indiscriminate when it comes to varieties of small pumpkins, they just like pumpkins in general.