Possibly Arum maculatum, "cuckoo pint", "Lord's and Ladies", and several other non-official names. There are several other arums with spotted leaves.

At first glance, I don't think that's it. The leaves on my plant are rather lax, and not arrow-shaped. Arums I believe are sturdier.

Its hard to make out the leaf shape, because all the leaves are twisted and curled in the photo. Arum species have hastate leaves, but they arent always sagittate. The leaves look hastate in the photo. The texture seems right. These leaves would seem more flaccid if compared to other aroids like Monstera and Philodendron. I agree that this is Arum maculatum Lords and Ladies. If you dont think the leaves are hastate, would you submit another photo, with a leaf entirely unfolded, to show the shape.

I’m not completely convinced it’s A maculatum. That is a weed in my garden and I know it well. This plant looks a bit too sturdy and fleshy and the spots are a bit too well defined. The leaf size in proportion to the stem seems off too. Also A maculatum is already dying back in my climate. It’s hard to believe it would be greener in Texas in May than here in the UK. Could there be a Texas variant?

Better picture of the leaves:

The curling seems to be a consistent feature of this plant. To me, the leaves don't resemble any of the arum maculatum photos I've found online - both in terms of the shape of the leaf itself and how it is held on the plant. I'll see if I can get an answer through the organization that organized the plant swap. Thanks for the suggestions thus far.

What are the dimensions of the leaf? Do let us know if you get a name.

I've been informed from the swap group that it's false African hosta, Drimiopsis maculata. This appears to be a highly variable species, but some online photos do look like my plants.

Aha. Mystery solved. Thanks for the id. Can it be grown outdoors where you are?