8 species have Ice Body as a hidden ability, 11 as a normal one

Effect, in PokéAPI's words

“Heals for 1/16 max HP after each turn during hail. Protects against hail damage.”

As a hidden ability

Species	Slot	Note
Seel	Hidden	Since Generation V
Dewgong	Hidden	Since Generation V
Regice	Hidden	Since Generation V
Glaceon	Hidden	Since Generation V
Mr. Rime	Hidden
Frigibax	Hidden
Arctibax	Hidden
Baxcalibur	Hidden

As a normal ability

Species	Slot	Note
Snorunt	Normal
Glalie	Normal
Spheal	Normal
Sealeo	Normal
Walrein	Normal
Vanillite	Normal
Vanillish	Normal
Vanilluxe	Normal
Bergmite	Normal
Avalugg	Normal
Arctovish	Normal

Elsewhere in PokéAPI

2 more holders without a page here

Alternate forms and other species that PokéAPI lists with Ice Body.

Mr Mime Galar (hidden), Avalugg Hisui