Interesting vintage chips. These certainly look like clay chips, but I’ve never seen this triangle mold before.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/323731286841
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/323731286841