One of my best friends is a frizzle breeder so I believe there are specifics when it comes to the frizzle gene, singles and doubles. I can ask if you like. Otherwise the frizzle gene can show up in all sorts of X-breeds, such as an Australorp.They do look very similar!
Do you know what breeding yours is? Is he a pure frizzle, or a frizzle of a different breed?
( always find that a bit confusing, am I right in that 'frizzle' is a breed in itself, but you can also have frizzles of any breed?