leapers and clowns all out on the jump!
"The-Circus-Boys-Across-the-Continent-or-Winning-New-Laurels-on-the-Tanbark"
Darlington, Edgar B. P.
The looping, interwoven network of vines beneath them, each cable as thick through as a man's body, bellied out and down sharply as the leapers reached the edge of the fern-tree forest which surrounded the copse of fan-palms.
"The Thing in the Attic"
James Benjamin Blish
But once he had landed, he was safe-he could always claim to be peacefully exploring, hunting leapers or some such thing.
"Duel on Syrtis"
Poul William Anderson