Do floating islands exist?
The floating islands do exist but are less frequent as a man-made phenomenon. Most of the floating islands are found on marshlands, lakes, and comparable wetlands. They are made of bundled reeds and range from a few inches to several feet.
only in people's dreams they do
Yes, there are floating islands. A short time ago, I saw one on a travel show, it wasn't very big, but it was an independent nation and native islanders lived there. I can't remember the name of it.