Did you possibly mean one of these? nila, nils
Definitions
Etymologies
- From Russian нилас (nílas). (Wiktionary)
Examples
“The new ice growing in these calm ponds forms unbroken sheets known as nilas ice.”
“Currents or light winds often push the nilas around so that they slide over each other, a process known as rafting.”
“Grease ice develops into a continuous, thin sheet of ice called nilas.”
“Initially, the sheet is very thin and dark (called dark nilas), becoming lighter as it thickens.”
“Wilkinson and colleagues just completed a series of lab experiments measuring the difference between nilas and pancake ice.”
“They found that pancake ice actually forms faster than nilas ice.”
“Ice accumulates on the bottom of a single sheet more slowly than it does around crystals bobbing up and down in the water, so pancake ice 0-15 cm thick can form in the same time as 1 cm thickness of nilas ice.”
Lists
These user-created lists contain the word ‘nilas’.
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Words for ice and snow
Environmental Ice and Snow
(excluding all the food ice)ice, icicle, frazil, frasil, sleet, slush, snow, flurry, snowfall, freeze, flash-freeze, quick-freeze and 618 more...
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Arctic
cloud-berg, calf, icefall, polynya, lead, growler, icescape, pogonip, sconce, nilas, burga, aufeis and 10 more...
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Driftology
Words combed from 'Moby-Duck: The True Story of 28,800 Bath Toys Lost at Sea and of the Beachcombers, Oceanographers, Environmentalists, and Fools, Including the Author,Who Went in Search of Them.'
driftology, beachcomber, skookum, wrack, jackstraw, driftologist, garbage patch, ghost net, autodumbfoundment, phytoplankton, gyre, hindcast and 58 more...
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Ice Ice Baby
Geographical and weather-related ice formations and phenomena.
frazil, shuga, grease, brash, ice cake, finger rafting, lead, polynya, sea ice, pack ice, ice-blink, ice scour and 88 more...
Tweets
Looking for tweets for nilas.

alexz In Canada, the monster we watch out for is God-Nila
Nilas are defined by Environment Canada here
http://www.ec.gc.ca/glaces-ice/default.asp?lang=En&n=05F5AE4E-1&wsdoc=A763C9A6-99E3-4FD0-AF5A-5378B326C62E
"A thin elastic crust of ice, easily bending on waves and swell and under pressure growing in a pattern of interlocking "fingers" (finger rafting). " Jan 24, 2013