[zachrose]

I've never heard of a "tree swing" before, or any swing named after the thing it's hanging from.

I would call the thing in the last panel a "tire swing." (Native English speaker, FWIW.)

[robbrown451]

"Tree swing" seems fine to me (native speaker as well), the commonality of all pictures is it is a swing, set up in a tree (albeit incorrectly or poorly in many cases). If I google "tree swing" it is clear that this is not a particularly rare way to refer to this specific sort of swing.

[justinlardinois]

Yeah, it's worth noting that "tree swing" isn't a common idiom; I only meant a swing that's set up on a tree. I just didn't want to call it a "tire swing" though because it only took that form in one panel. Maybe "rope swing" would be the best name for it?

[inimino]

It's just a swing.

[taneq]

So you're saying the term 'tree swing' is overengineered? ;)

[justinlardinois]

I'll take it.