Can’t miss in the exploratory visit to the supermarket:

They are called frozen treats and (of course) there’s a whole story behind them. Here, a short glimpse of the full text from PingMag.
“Frozen treats began to be produced as a substitute for ice cream after World War II, when almost all dairy products were designated for military use. A popular simple treat at the time was merely ice mixed with sweetener, into which a pair of disposable chopsticks were stuck. Very basic, but it made folks happy in those tough times. Beginning in 1952, treats with milk finally began to appear, and soon shops sold a great variety of frozen delights.”