It might just be Tall Fescue, and it looks larger than your Turf Type Tall Fescue. Turf Type Tall Fescue is the same species, it’s just been “bred” for certain characteristics. Genetically speaking, it seems like it would be probable for some of the TTTF plants to express TF qualities. Think about random redheads.

A grass (maybe switchgrass?) Was planted in that area several years ago, but this looks so ordinary I'm not sure if it is not just a weed. I mulched around it just in case it is worth keeping!

Looks vaguely familiar, but it's hard to say what it is. Can you post a photo of the full plant growing, and in what location?

Mix of Tall Fescue and Kentucky Bluegrass Basic care tips: - Fescue does not tolerate scalping, It needs to be maintained at about 3". - Apply fungicide on a regular basis through fall, as fescue is susceptible to brown patch. Typically every 28 days or as instructed by the product. Rotate Scotts Disease-Ex with Bayer Fungus Control every application. - Both of those grasses are cool season grasses that struggle in the heat. They will require irrigation to survive, approximately 1 inch of water per week. You measure 1 inch by placing a tuna can in the yard when watering. When the tuna can is full, that's 1" of water. Regardless of that, if at any point you see the grass wilting, turning grayish in patches or even browning, water. - Don't fertilize in the summer. Cool season grasses receive most of their fertilizer in the fall. That's about it for now, come back early September and we'll see where you're at and what you need to do from there.