Wandered across tag kangaroo_position (five posts),
but checked internet and there are two types of kangaroo position (that i could find)
and e621's five posts apparently depict neither.

2 kangaroo position:
1) sex position: Only helpful example image i found is stick figures at https://www.girlsaskguys.com/sexual-behavior/q2323678-what-is-your-opinion-on-the-kangaroo-sex-position
Text description (by "Dr. Jess") at https://www.sdc.com/kink/bdsm/k-is-for-kink/ says "The Kangaroo Sex Position involves one partner crouching on all fours with the knees bent while the insertive partner crouches and penetrates from behind. They can thrust and hop around like kangaroos."
2) a way to carry a baby around. example: https://www.babyktan.co.uk/baby-ktan-kangaroo-position

The 5 posts are
1) post #3049729 (apparently a kangaroo in a position ... uploaded by artist in Mexico whose tag skills apparently rusty) (EDIT: Removed kangaroo_position tag from 3049729 )

Two below probably reverse_piledriver_position
2) post #19397
3) post #6288

Two below with two tops:
4) post #116893 : shortly after piledriver position and reverse_piledriver_position ?
5) post #10885 : piledriver position and reverse_piledriver_position ?

Am i correct in thinking all five posts do not depict a kangaroo_position ?