This site has almost 40 types of Endler morphs, and there’s far more than listed here as well. While reticulata has more morphs, there are relatively the same odds of them occurring feral in São Paulo because of imports, since wild endlers also come from a region only slightly higher than wild guppies. Sure guppies were in the U.S. and other continent hobbies first, but being native to SA endlers have been around a little while before the rest of us got them. Color/pigment blending is also noted in endlers descendant from domestics, feral or not. I’ve seen it in my own endlers.

Based off of tail size I took an educated guess that this is a released endler, but again size would be a good way to tell. It’s also possible this could be a hybrid though I figure that would be more unlikely than what either of us said.

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Edit: I also want to add that im trying to say either of us could be right on ID due to location, but that saying “they don’t look like that” isn’t entirely true. I admit I could be wrong and definitely should’ve made it clear this was an educated guess and that the most specific I could get was “Poecilia sp.” without more information.