The history of Cracker Jack prizes (2016)
antiquetrader.com
antiquetrader.com
I'd imagine any kid from back then got at least one 3D photo of a gopher standing on its hind legs, with the admonition from other kids to squeeze the sides of the lenticular photo inwards so that the paper curved concave, to improve the 3D effect.
(Or maybe it was a marmot: https://i.ebayimg.com/images/g/doEAAOSwFpVbV73H/s-l1600.jpg)
For those of us from the UK of a certain age Cracker Jack was a kids tv show that ran on Fridays.