I was mowing during the day and I came upon something at the edge of the lawn that reminded me of the few baby variegated Yuccas I have, but as I looked closer I saw it was grass.
I'm not sure what kind of grass, but I know it's not from any variegated grass parent. This would be a brand new mutation if it really is variegated grass. I mowed around it and I plan on transplanting it to the garden bed soon.

You can see the green grass on the same root system right next to the two possible variegated ones:

It has some characteristics of these:

Phalaris arundinacae, Ribbon Grass...but it's too short.

Pleioblastus fortunei, Dwarf Whitestripe Bamboo...but again, too short.

Allium tricoccum, Wild Leek, Ramp...this may be the closest. It's a Lily, and the leaves grow straight of the ground. Sometimes it will show variegated leaves. It usually has wider leaves. If it's a wild Allium, you'll know when you transplant it, because you'll find small bulb-like tubers under it.

S. glauca:

Another possibility I think might be Thin Paspalum (Paspalum setaceum), I wish it were this since it's at least a short lived perennial.

I read Yellow foxtail is an annual, so the variegation would be lost when it dies in the winter, I wonder if I kept it as a houseplant if it would live for years?

The only grass I've found so far that it might be is Yellow Foxtail Grass (Setaria glauca) or Thin Paspalum (Paspalum setaceum), but I'm still not 100% sure.
Here are some pictures of the same grass type but just the typical green, you can see how fuzzy the entire leaves are, even the leaf edges have hairs on it:







You can see how I spotted it, the grass stood out when mowing outside of our centipede sod area: