Okay, so here's some data: "A gas dwarf is a gas planet with a rocky core that has accumulated a thick envelope of hydrogen, helium, and other volatiles, having, as a result, a total radius between 1.7 and 3.9 Earth radii (1.7–3.9 R Earth); The term "super-Earth" is also used by astronomers to refer to planets bigger than Earth-like planets (from 0.8 to 1.2 Earth-radius), but smaller than mini-Neptunes (from 2 to 4 Earth-radii).

So going from this rather easily found data, I'm going out on a pretty thick limb here, but I have to say no.

Could there be a binary planetary system, which contained a mini-Neptune, and a super-earth? Probably not lol but it seems more likely than a super-earth with a mini-Neptune as a moon.

That being said, universe is so vast, and most things we've seen with JWT has made us rethink a lot of the astrophysical standard concepts.

Total copout, but maybe?

Well, I never thought about that. I mean, would a slice of toast fit in a four-dimensional toaster? Would you need a four-dimensional piece of toast?

A toaster that gets hot enough, fast enough, to toast a slice of bread, would likely be so hot that it would carbonize the bread (fancy term for burn the shit out of it lol.)

You would need to lower the pressure greatly for the water to boil that quickly, without risk of rapid deconstruction of your kettle. Even then when you went to poor it out it would cool rapidly because of that pesky law of thermodynamics and the fact that it boils at a much lower tempature at the lower pressure levels.

tl:dr Physics!