I really encountered 乒乓 (pingpong/table tennis) and 曱甴 (cockroach).
Are there other words that were created for this usage? Must be used together with no meaning individually?
I feel these words are rather amusing and a bit cheeky.
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Yes, they are called 连绵词.
There is a list on https://en.wiktionary.org/wiki/Category:Chinese_disyllabic_morphemes