Tom uses a shuttle to travel to warp ten. Once he reaches the threshold he's everywhere at the same time, becomes Kwisatz Haderach. When he comes back he starts mutating, loses his mind, kidnaps the captain, they fly off at warp 10.
By the time voyager finds them they've devolved(or evolved) into small amphibians, luckily the doc has a magic serum that will fix them. As the crew are about to leave they notice a bunch of tadpoles escape from the nest. Basically Tom and Kat had tadpole babies.
Same. I vaguely recall something about these two de evolving into catfish with legs (a prior meme post is the only reason I remember anything) and... I am going to guess they made legged catfish babies or something. But I could be completely wrong. I hope someone fills us in.
Star Trek Prodigy had Janeway acknowledge being turned into a salamander. Does she know about/remember the lizard babies? it leaves only more questions unfortunately.