Frost Breath is learned by 5 species by level, 36 by machine and 1 by egg

Effect, in PokéAPI's words

“Always scores a critical hit.”

Who learns it

36 species in all, 8 of 9 games shown

Scarlet and Violet: 6 species

Species	Method	Level
Cubchoo	Level up	18
Beartic	Level up	18
Snorunt	Level up	30
Glalie	Level up	30
Froslass	Level up	30
Cryogonal	Egg

Brilliant Diamond and Shining Pearl: 3 species

Species	Method	Level
Snorunt	Level up	30
Glalie	Level up	30
Froslass	Level up	30

Sword and Shield: 5 species

Species	Method	Level
Cubchoo	Level up	18
Beartic	Level up	18
Snorunt	Level up	30
Glalie	Level up	30
Froslass	Level up	30

Ultra Sun and Ultra Moon: 36 species

Species	Method	Level
Snorunt	Level up, Machine	37
Glalie	Level up, Machine	37
Dewgong	Machine
Cloyster	Machine
Jynx	Machine
Lapras	Machine
Articuno	Machine
Mew	Machine
Delibird	Machine
Smoochum	Machine
Spheal	Machine
Sealeo	Machine
Walrein	Machine
Regice	Machine
Snover	Machine
Abomasnow	Machine
Glaceon	Machine
Froslass	Machine
Vanillite	Machine
Vanillish	Machine
Vanilluxe	Machine
Cubchoo	Machine
Beartic	Machine
Cryogonal	Machine
Amaura	Machine
Aurorus	Machine
Bergmite	Machine
Avalugg	Machine
Crabrawler	Machine
Crabominable	Machine
Mareanie	Machine
Toxapex	Machine
Dewpider	Machine
Araquanid	Machine
Golisopod	Machine
Bruxish	Machine

Sun and Moon: 36 species

Species	Method	Level
Snorunt	Level up, Machine	37
Glalie	Level up, Machine	37
Dewgong	Machine
Cloyster	Machine
Jynx	Machine
Lapras	Machine
Articuno	Machine
Mew	Machine
Delibird	Machine
Smoochum	Machine
Spheal	Machine
Sealeo	Machine
Walrein	Machine
Regice	Machine
Snover	Machine
Abomasnow	Machine
Glaceon	Machine
Froslass	Machine
Vanillite	Machine
Vanillish	Machine
Vanilluxe	Machine
Cubchoo	Machine
Beartic	Machine
Cryogonal	Machine
Amaura	Machine
Aurorus	Machine
Bergmite	Machine
Avalugg	Machine
Crabrawler	Machine
Crabominable	Machine
Mareanie	Machine
Toxapex	Machine
Dewpider	Machine
Araquanid	Machine
Golisopod	Machine
Bruxish	Machine

Omega Ruby and Alpha Sapphire: 28 species

Species	Method	Level
Snorunt	Level up, Machine	37
Glalie	Level up, Machine	37
Dewgong	Machine
Cloyster	Machine
Jynx	Machine
Lapras	Machine
Articuno	Machine
Mew	Machine
Delibird	Machine
Smoochum	Machine
Spheal	Machine
Sealeo	Machine
Walrein	Machine
Regice	Machine
Snover	Machine
Abomasnow	Machine
Glaceon	Machine
Froslass	Machine
Vanillite	Machine
Vanillish	Machine
Vanilluxe	Machine
Cubchoo	Machine
Beartic	Machine
Cryogonal	Machine
Amaura	Machine
Aurorus	Machine
Bergmite	Machine
Avalugg	Machine

X and Y: 28 species

Species	Method	Level
Dewgong	Machine
Cloyster	Machine
Jynx	Machine
Lapras	Machine
Articuno	Machine
Mew	Machine
Delibird	Machine
Smoochum	Machine
Snorunt	Machine
Glalie	Machine
Spheal	Machine
Sealeo	Machine
Walrein	Machine
Regice	Machine
Snover	Machine
Abomasnow	Machine
Glaceon	Machine
Froslass	Machine
Vanillite	Machine
Vanillish	Machine
Vanilluxe	Machine
Cubchoo	Machine
Beartic	Machine
Cryogonal	Machine
Amaura	Machine
Aurorus	Machine
Bergmite	Machine
Avalugg	Machine

Black 2 and White 2: 24 species

Species	Method	Level
Dewgong	Machine
Cloyster	Machine
Jynx	Machine
Lapras	Machine
Articuno	Machine
Mew	Machine
Delibird	Machine
Smoochum	Machine
Snorunt	Machine
Glalie	Machine
Spheal	Machine
Sealeo	Machine
Walrein	Machine
Regice	Machine
Snover	Machine
Abomasnow	Machine
Glaceon	Machine
Froslass	Machine
Vanillite	Machine
Vanillish	Machine
Vanilluxe	Machine
Cubchoo	Machine
Beartic	Machine
Cryogonal	Machine

Changed over time

One change since Generation V

1. Through Gen VPower 4060 from X and Y, Generation VI