Koonak was a young boy taken in by Mr. Freeze.
After his parents' death, Koonak met Mr. Freeze. He took care of the young boy when he was hiding out in the Arctic. Koonak was very pleased with the help, and was convinced Freeze could get his wife back. Part of that operation involved Barbara Gordon; after she was kidnapped, Koonak took care of her. Freeze promised him she wouldn't be hurt. However, upon seeing that Freeze and Belson were going to kill Barbara during the operation, he defied Freeze and stalled him long enough for Barbara to escape.
After Batman and Robin came to the drilling platform and a fire broke out, Koonak fled into a corner of the operation chamber. Upon Freeze's request, Barbara came back to save him, while Batman went for Nora. Following the escape, Koonak watched with regret as the platform finally exploded. Despite being dismayed at Fries for attempted murder, Koonak was still regretful that his surrogate father apparently was killed in the blast. Koonak's life after this was unknown, nor was it revealed if he ever learned that Victor Fries survived.
The back up story in Batman Adventures #15 show that Koonak ended up living at an orphanage where following the main story he is visited by Nora Fries. He relates to how Victor saved and took care of him, but expressing doubt if there is still any good in him or that he is still alive.