no such animal as MINI YORKIE most likely runt of litter.
There actually is a mini-yorkie, generally referred to as “teacup” to distinguish them from the larger “toy”. They may not be AKC recognized, but they do exist.
You are mistaken. There are breeders who specialize in them. They are sometimes also referred to as Teacup Yorkies. Depending on the breeder they are also (imo) absurdly expensive.