Hi,

I have 3 of these plants in my garden. At first I thought they were a tomato variant but now I'm not sure what they are. Doesn't look like they're going to produce anything.

Hi there and welcome! It looks like Velvetleaf, which is a kind of Indian Mallow:
Velvetleaf (Abutilon theophrasti)

Hope that helps!

Thank you.

Just googled some images of it. That is exactly what it is. Now, I'm just wandering how it got there. There are no other plants in my neighborhood that resemble it

Birds maybe ?