I'm posting here seeing as Blue asked for a few real map names, taken directly from the game's files. Of course, the translation is only as accurate as internet automatic translators allow, but rest assured I'm checking out every individual character for its meaning, to get as close an approximation as possible
The first plant map with plant-grafted children, where you see a little plant-grafted Sabitsuki, returned the name "Fantastic Circuit 2". This is a rather weird name, so I examined the individual characters, and they seem to stand for "Dream + Thought" (fantasy), "Time + Road" (circuit). So perhaps a more appropriate name would be "Imaginary Past 2", or something along those lines
The second of the plant-grafted children maps has the same name, without the 2, so "Fantastic Circuit"/"Imaginary Past"
I don't really know where the white puddle place is, please post a picture or directions to get there when you have the chance
The plant area with the gas mask effect is called "Plant Circuit Deepest Section"
The other area with purple and green plants is called "Plants and Tentacles". What a weird name… But the characters really don't seem to be saying anything else, just Plant and Tentacle
If you have any more maps you need named feel free to tell me, I'll do it when I get the chance