I’m thinking they have some Xiphophorus Variatus in them. What do you think? They are cold water, outside tank, produce bland babies.
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This specimen is a Xiphophorus variatus. Mind that there are variatus platies with a more pointy nose and a rounder nose. That's what the Xiphophorus variartus species are known for besides the different pattern or markings in the wild.
I also like to put out here, that there are way more wild platy species besides Xiphophorus maculatus and Xiphophorus variatus in the wild. And what's also important to know, is that although platies occur in tropical countries (Central- and South-America), a serious number of them live in colder water. For there are subzones that are subtropical instead of tropical within a tropical country. Also altitude is in play when it comes to lower water temperatures. Those platies that occur in subtropical areas, shouldn't be kept in warmer water. For they will die at some point because of this.
For a lot of people make the mistake to label all platies (and more livebearers eg. swordtails) as being tropical fish. You just need to know from what area they are to determine them as being tropical or subtropical.
I also keep platies outdoors during the better months of the year. And I always harvest them in fall when the water temperatures are between 10-15°C.
Most livebearers can be kept outdoors during the better months, btw. When we just look at the common commercial livebearers such as guppies, swordtails, mollies and platies, they all can be kept outdoors. Just note that long finned guppies are a weaker than short finned guppies, when keeping outdoors. Long finned guppies will do fine starting from 17°C water temperature and up. Short finned guppies will still do fine at 12°C and up. But for all these livebearers goes that you need to adapt them slowly to such temperatures first before keeping them at lower temperatures of course. And if you'll harvest them in fall, these fish and their offspring are much stronger than their relatives that are kept indoors. Keeping livebearers and other aquarium fish outdoors during a number of months, is something that I've done ever since halfway the 1980's.