Ice Bro.

From the Super Mario Wiki

An Ice Bros. are a sub-species of the Hammer Bro. from New Super Mario Bros. Wii. First introduced on the map of World 3, they appear to look like normal Hammer Bros., but have light blue shells, shoes, and helmets. They can throw ice balls at Mario and the gang, which will freeze and damage them. Their ice balls can also hit other enemies (including other Ice Bros.) and freeze them as well. Like Hammer Bros., Boomerang Bros., and Fire Bros., they usually attack around other Ice Bros. If a Yoshi catches an ice ball thrown by them, the Yoshi spit them out in the form of blue fireballs that freezes anything in its path.

Hammer Bros.
Characters	Army Hammer Bro. • Bamma • Border Bros. • Dr. Topper • Flare • Hammer Bro. Captain • Hamma Jamma • Hamma Jamma's Father • Hamma Jamma's Grandfather • L33t Hamm3r Broz. • Mr. Hammer • Ojiisan and Obaasan • Toge Bro.
Species	Amazing Flyin' Hammer Bro. • Boomerang Bro. • Business Bro. • Calm Amazing Flyin' Hammer Bro. • Calm Hammer Bro. • Chomp Bro. • Dark Boomerang Bro. • Dark Fire Bro. • Dark Hammer Bro. • Fire Bro. • Goomerang Bro. • Hammer Bro. • Ice Bro. • Limbo Bro. • Sledge Bro. • Sumo Bro. • Yo Bro.