I didn't even know it had a name. I grew up in a place where there were only two of them.
Someone older than me says it was called "ola", because it wobbled. I don't know if it wobbled on purpose or if it was a faulty design, and if all children would call it so out from our hometown.
To me it was "rueda", and I think I heard some other children call it "noria".
A Google search gave me "juego giratorio", "carrusel" and "volantín", but for me, "volantín"/"volantines" was like the one in the picture.
I would understand "carrusel" in context.
I'll make a little poll and come back to you if I find something more helpful.
