Offhand, looks more like a virus or herbicide drift.

Oh my gosh, I did just put down some "Weed & Feed" fertilizer on my
lawn, which borders the vegetable beds. I wonder if some drifted onto
the tomatoes??? If that was the case, ya think they're gonners?

I guess my real question here is whether it'd be inadviseable to plant
more tomatoes in this same spot, adding mulch and being careful to
only water from beneath?

-F