Yes-tom thumb is a lovely little lettuce,bit of a job to find the seed though-these days,
Webb's wonderfull, once you have had a webbs-you will never want any other kind of iceberg type lettuce.
There is a local veg shop around here who get the webb's in especialy for locals during the late spring and early summer, and its easy to see which is the webb's -they are the ones that vanish off the shelves first and leave all the other iceberg types still there.
Pigeons love e'm also, I planted a row out one spring, at around twelve noon,-went in for a bite to eat and have lunch, came out half an hour later, and all that was left was the bare stalks sticking out of the ground, if I had -had a scatter gun with me at that time I would definatlly have been having pigeon pie for tea.