By Hank
Cheshire,
United Kingdom 
My cousin ( who lives a long way from me ) and I both grow and compare out tomatoes. In her most recent email she wrote -
" Some of our tomatoes are producing little green ones now, and we appear to have one variety which is "flat"; ever heard of them? "
No, I haven't, but some of you guys must have. If so, some details would be welcome.
19 Jun, 2017
Answers
Wondeer if she could take a photo and send to you to add to the question. Never heard of flat tomatoes before.
19 Jun, 2017
Will ask her. All her toms are very small as yet so I don't suppose they'll be any different at this time. Sending her a message right now.
19 Jun, 2017
I seem to remember a flat one with a sort of ridged top surface. I think it was one used for cooking rather than salad but sorry can't remember the name. Try looking at Suttons veg catalogue on line.
19 Jun, 2017
Thanks Sue, just awaiting a reply from cousin MARGARET in Colchester, would you believe it.
19 Jun, 2017
Apparently cousin M was referring to Marmande, which I didn't find flat at all but big, crinkly on top as S said, and not very tasty, and won't be growing again.
20 Jun, 2017
Yes that's the one Hank.Never tasted it myself.
20 Jun, 2017
Can't say that I've come across a variety which has flat fruits. I have, in the past had fruits that have been distorted which I put down to an unstable genes or variety.
19 Jun, 2017