Does it have a supermarket

Yes

It is not a super walmart. They have frozens goods, milk and eggs with shelfed food. But no fresh fruits.

That is no supermarket at there.

It's as not as big as the Super Walmart in Walpole which has way more prepared foods & fresh vegetables. Although Quincy does everything else including freezer sections.

It does, but with a fairly small selection compared to most Walmarts