Icicle

Icicle is the name of two DC Comics villains. Both are recurring foes of the Justice Society of America

Icicle 1
Dr. Joar Mahkent was a scientist who invented a cold gun and used it to commit crimes. He clashed with the Green Lantern (Alan Scott) on a regular basis alone and the JSA as part of the Injustice Society of the World.

Icicle 2
Cameron Mahkent, son of Joar Mahkent was a mutant born with ice powers.