So tags merry-go-round, merry_go_round, and merrygoround all alias to carousel,
but there are at least two kinds of merry-go-round.

{ 3 aliases with NO forum-thread:
merry-go-round -> carousel : alias #43736
merry_go_round -> carousel : alias #43738
merrygoround -> carousel : alias #43737 }

https://en.wikipedia.org/wiki/Merry-Go-Round_(disambiguation)
includes
1) "A merry-go-round or carousel is a popular amusement ride. "
2) "Roundabout (play), a popular park ride"
3 a to z+) That disambiguation page also lists nine films, an Australian TV series, a BBC TV series, a BBC radio show, a music band, 3 albums, a lot of songs, a painting, a clothing retailer, and Merry-go-round train.

https://en.wikipedia.org/wiki/Roundabout_(play)
says "A roundabout (British English), merry-go-round (American English), or carousel (Australian English), is a piece of playground equipment, a flat disk, .... The disk can be made to spin by pushing or pulling on its handles"

Since there are various merry-go-round, and horse-statue amusement ride tagged as carousel,
I'm thinking the playground equipment have a tag starting with roundabout.

Since roundabout is also a road traffic thing ( https://en.wikipedia.org/wiki/Roundabout ),
and wikipedia article about the playground equipment/ride is titled Roundabout_(play)
my main suggestion is that this playground equipment be tagged as roundabout_(play)

And since merry-go-round is ambiguous, secondary suggestion is the merry*go*round tags alias to merry-go-round_(disambiguation)

Example of playground roundabout at:
post #4318040

No objections posted, so have changed tag of post #4318040
from carousel to roundabout_(play).

Note: e621 has another tag roundabout_(artist).

Here is draft for Edit Reason
for anyone finding another playground roundabout
"carousel (amusement ride) -> roundabout_(play) (playground equipment) : https://en.wikipedia.org/wiki/Roundabout_(play) "

I think I hit upon at least one of these tags before on a post, but don't remember if I had the same issue.

Yeah, this kind of makes sense that it would be tagged that way.