[dzamie]

Yep, and as mentioned in the article, there's also a he-he. A description is never given of it, but it's a safe assumption that it's a tiny haha, possibly only a couple inches high.

Interestingly, if this is accurate, it means that the front/backness of the vowel in hehe/haha/hoho correlates with its size.

[knolax]

A Hon-Hon is a Ha-Ha where the incline leads directly into a tunnel.

[radeklew]

And the chon-honnel is the one from France to England

[ljm]

Unfortunately due to escalating tensions, the ‘ke-ke’ became known as a Demilitarized Zone.

[choeger]

Iirc correctly a hoho is like a haha just deeper.