Q: These are on a tomato plant grown by my neighbor from purchased seed. What would you say we have?
A: A bit of Google work and it’s all there. The phenomenon is called fused blossoms (or megabloom) and it seems to be associated with tomato varieties that produce large fruit.
There are multiple ovaries in a fused flower and this gives rise to huge but misshapen “gnarly” fruit.
I’d love to see what your neighbor’s tomatoes look like!