It's kinda surprising that there isn't any ice kaiju yet. It would be amazing to see one in action.
Topic on User talk:AngiraBlu
Well, technically there's...
Angira/Anguirus from the scrapped precursor to GMK, GVBA,
Barugon from Gamera (the Heisei manga version takes the power up a few pegs),
Blizzard from Primal Rage,
Methuselah (kinda; when he's disguised as a glacier),
Scylla (can refreeze polar ice caps)
Gezora (kinda; has really cold body and emits a super-cold gas),
Sub-Zero Manta,
the scrapped AstroGodzilla (has an ice ray),
Zone Fighter (has Meteor Freezer),
Kiryu (has Absolute Zero Cannon),
and any other kaiju that has cryokinetic abilities that I can't even think of, at the moment.
I also like how this artist portrays Gezora's cold abilities. I personally image Gezora mixing that with his ink.
https://www.deviantart.com/trollmans/art/Folly-of-Man-Gezora-803247281
I knew about Kiryu and Scylla but ice isn't really their main theme. The others I didn't know about, thanks.
No problem.
Also: Snow Godzilla (from Shinkalion The Movie) and Peguilla (from Ultra Q). The last one has ability to cause ice storms.
Fonshuragon is also a more obscure example
There's a ton from Ultraman. Allosaurus already mentioned Peguila but there's also Guigass, Woo, Snowgon, Iceron, Gandar, and others I can't recall at the moment.