Douglass Parker is my favorite translator of Aristophanes; among all of the others I've read, his translations are closest to the spirit of Aristophanes, though not always the most accurate. And 'The Frogs' is just my favorite Aristophanean comedy; to see the the three giants of Greek tragedy brought down to earth, humbled and slightly humiliated is a treat: Euripides gets it the worst, more so than Sophocles (Aristophanes' favorite, if he has one) or Aeschylus. Lattimore as always translates well, though, by now, his language might seem a bit antiquated.