I guess that depends on who "they" is. I've heard old digger guys call them, "Bennies."
Back in the day, I don't believe they used the term.
MARBLES
ARE DOWN AT
JACKSON'S TOY STORE
Water St., Benton Harbor, Michigan.
The lowest prices and the largest stock
in either city. All kinds of common,
both gray and colored, china painted,
both glazed and unglazed, china bull's
eyes, glazed, ballots black and white,
imitation agates or falsies, imitation
agates flamed, jaspers or cloudies
glazed,glass threads all fine, glass braudies,
glass opals, glass opals striped, imitation carnelians,
flint agates, carnelian agates, onyx agates, tiger eyes,
glass threads all sizes…"
Vintage Marbles and Marble Collecting Resources - Part 14