The Ice Colosuss is a Replica form of the Ice Titan. While in Kingdom Hearts Birth by Sleep, it appears alongside Hades in Aqua's story. Ice Colossus can also be fought at Mirage Arena in Kingdom Hearts Birth by Sleep. After the battle Hades remarks that the fake wasn't good enough, revealing the "Ice Colossus" to be an inferior copy of the actual Ice Titan.
Hades And Ice Titan - Kingdom Hearts Birth by Sleep YouTube