I've only ever heard swim trunks and bathing suit. (The last one is generally used more for female attire, but I wouldn't blink if I heard it used for men's swim trunks.)
I don't know how much regional variation there is, but I grew up in the kind of southwest (wow, I don't even know what part of America Utah is considered to be) and I would call them either swim trunks or even just swimsuit. I would definitely know what you meant with swim trunks, and would not find it a jarring usage.
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