Close relative to the Sidehill Snipe, each of two types noted for having
one long and one short leg. As a Boy Scout initiation hazing the older
boys would sit the Tenderfoot scouts out to catch a right-handed Snipe
in a gunny sack, with instructions to face clockwise on the hill, as the
left handed Snipe tasted bad.
Variations on the theme include left and right handed monkeywrenches and
screwdrivers. AFAIK skyhooks only came in one chirality.
Since Farmer In the Sky started as a serialization in the Boy Scout
magazine, I bet there's a link. Possibly a "correction" made by an
editor? Or maybe it's a regionalism - Snipe could be the Western
version, Snee the Eastern? I'd have to consult Patterson to determine
where Heinlein was living when writing Tenderfoot In Space.