Indeed; frozen cubes of coffee or tea in a glass — generally with a side of milk or liquid coffee/tea to pour into it — is a fairly common presentation throughout more upscale/trendy coffee shops and restaurants in Southeast Asia. It’s largely an aesthetic choice and looks nice in a photo. In practice, it takes a while to drink and you probably will find yourself jabbing away at the cubes with your straw or silverware to try and get them to melt faster. 
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