Yep! This was taken in my backyard, which I let grow pretty wild, and I know for a fact that St. Augustine and rescuegrass like to pop up quite often.
However, while this might just be a rogue aphid, it seemed like they were quite heavily colonizing a nearby dandelion - would this raise any suspicions, or are aphids known to simply choose "unusual" plants sometimes?

Those were more likely Uroleucon if they were red, that genus prefers Asteraceae.

https://influentialpoints.com/Gallery/Uroleucon_aphids.htm.

I can't think of any other aphid that's similar to this specimen / Hysteroneura setariae, and looking at the list of species that are known to colonize Dandelions, it doesn't match any of them.