IIRC, the current season is set two years before ANH. Ezra & Luke are 17 years old, Sabine & Wedge are 18. Again, IIRC.

And Hobbie Klivian making that “refresher course” pun in Starfighters of Adumar.

Yes, the term was widely used in the EU (and spawned a great pun in Starfighters of Adumar). I just interpreted the question as “has Disney imported the EU term in their current continuity?”, in which case the answer is yes.

Have you read the Lando comic miniseries?

To answer your question: yes, they’ve already called toilets “refreshers” in several current-canon novels. Not yet in comics and video games though.

Hmm. Since we mention the ducks, let’s mention Mickey Mouse’s human-sized side characters: Mortimer Rat, Goofy and Max, Clarabelle Cow, Horace Horsecollar. Bonus points for the rat being the same human-like size as the cow. In the comics, those weird dog-head “almost humans” are also human-sized, and so are the Beagle…