ambient snacking
n. Snacking on foods that can be stored and served at room temperature.
Other Forms
Responding to the torrent of furious messages, Sainsbury’s said via social media:…

"We’re also including 14 new ambient snacking lines, all at 50p and under 150 calories each, tapping into the healthy snacking trend."
—Adam Boult, “Sainsbury’s '£3 meal deal' change prompts fury among customers,” The Telegraph (London), September 06, 2016
We focus on ambient snacking — primarily fruit-based.
—Hannah Abdulla, “The bitesize interview — The Kids Food Co. CEO Sally Preston,” just-food, July 16, 2014
Paul also wanted to do something a little different and has installed shelving displaying ambient snacking between single-serve chilled drinks and chilled snacking offerings.
—“Malcolm's KwikSave, Chelmsley Wood,” Convenience Store, December 23, 2013
2010 (earliest)
Unearthed, a premium food and snacking brand is launching a range of new products for summer based on tapas and ambient snacking.
—Jeffrey Hyman, “New snacking products launched by Unearthed,” The Food & Drink Innovation Network, May 17, 2010
Other trolley features include a lockable cash drawer, logo board, ambient snack display area on the trolley top and two wheel brakes.
—“Caterer & Hotelkeeper, Volume 175,” IPC Consumer Industries Press, January 01, 1984