Called, Said that (slang abbreviation)
Structure:
という+ つ or っつ
In the problem:
「ヤクザつう者は、どんな奴なんだい?」
「っつ」 is a wrong answer. Instead, 「つう」is the desired input.
I don’t see anything in the write up that talks about when to pick one over the other. (answer seems like a ‘gotcha!’) I wish the structure section addressed this. If I look at the examples, it seems it will either manifest as 「つって・てった」. Or, if used before a noun or essentially anything else, it will manifest as 「つう」, e.g. 「つうもの」. This is inference on my part though. Is this correct?