Great Mark! It’s Scott! Er no, uh -

If anyone in these books had two friends named Scott, he'd have to shout Great Scott, Scott, it’s Scott! He’s becoming a human fish!

To which your friend Scott would ask why you’d called him by name, since it obviously slowed immediate comprehension of the utterance, especially  when compounded with that silly “great scott” ejaculation. We have enough scotts about. Don’t complicate things.

I don't know who this artist was, but it's like most DC stuff of the era - the aliens always looked doubtful. Especially if they were fish-creatures or biped reptiles. A more suspicious lot you never met. As for Mark's Amazing Powers, they seem to include the ability to make suds while he punches.