Here’s the Beav, masquerading as a huge, squeaky cheese curd on Oct 15, NATIONAL CHEESE CURDS DAY.
Are fresh cheese curds the only squeaky food that human eat? That depends, do you eat balloons?
OK, so why are cheese curds squeaky? Well, Wikipedia would tell you that it has to do with “air trapped inside the porous material.” However, I’ve eaten plenty of hotdog buns chock-full of air bubbles, with nary a squeak . . .
So, I’d go with this distinguished scientist from Wisconsin: