Someone born from artificial insemination. Typically from a anynonomous sperm donor. Usually used in as a slang term.
A child that is conceived from either frozen eggs/sperm or born from a frozen embryo. If the child is born from a frozen embryo that was adopted by people other than its biological parents then it is also a snowflake baby.
John: Dude, my brother and I were both conceived at the same time but our parents didn’t want twins so I was frozen for a couple years so there was an age gap. That means I’m a fucking cryokid bro!