I personally have not bred frizzle to frizzle. ( I do breed frizzles but I only have frizzle roos and smooth hens) but I am going by several sources( litature and a few people Ive spoke with that have bred frizzle to frizzle) and have not got curlies. Im not saying I know exactly about it nor am I an expert by any means but on the research Ive done people have bred frizzle to frizzle and not got curlies.