Sorry...I don't know what these fruits are called.
Doesn't look like they're going to tell me, either.
An Nguyen's pegged it. These are Chayote. Thanks, An!
Now I remember seeing the name on the price sign.
Also, here's a link with more info about the popular
relative of the cucumber and pumpkin:
Of course...now I'm honor bound to find some real quince!