chocolate wafer cookies?
I think this is what you are looking for:
Wtf is an ice cream sandwich? From a confused Englishman.
I used to buy these, they are pretty close.
But they are made and sold specifically to sandwich with ice cream, I have made that cake on the package, its awesome.
https://www.walmart.ca/en/ip/mr-christie-chocolate-wafers/6000197050251
I buy them at an Amish market in PA.