Looks a little like black cherry. Was there any of that around?

The only thing that I can find close to this is called a swamp dogwood, but I haven't seen the flowers or fruit to compare this to, nor have I seen any that are any of these plants larger than 3'.

Venation doesn't look like Cornus from here. I'd start with a Prunus like nevermind sez.

Dan

What about Chokeberry - Aronia (now Photinia). Photinia pyrifolia appears to be native to Florida.

Here is a link that might be useful: distribution in FL

The acuminate leaf tip is an indicator for Photinia. The key for Prunus is the glands on the petiole. Hard to ID from here. Perhaps if it is just a volunteer it can be pulled.

Dan

I pulled two up and potted them. It would be weird if it turns out to be aronia, because I just bought 4 seedlings, to see if they would do good here lol.

I'll def keep an eye on these plants and hopefully will figure out when they bloom, what their flowers look like, and what kind of fruit or berries they produce.

As far as black cherries are concerned, I do believe they grow around here as well, but to me, their leaves always look a bit more waxy/shiny than these do. Although the picture shows the plant I'm inquiring about as kind of shiny or waxy, that is because they are new leaves that have recently budded out. I'd say the mature leaves are a bit more fuzzy and less bright in color, if that means anything.