The New York Times has only three examples of ‘meat loafs.’ Here are two:
• And meat loaf -- I've known meat loafs
that have held otherwise fragmenting families together for ... Instead, I make three meat loafs
and slice them up. ...
• ... which opened in 1982 at 424 Amsterdam Avenue (80th Street) and specializes in homey fare such as soups, stews, muffins and meat loafs
But it agrees with Richard, and has 193 examples of ‘meat loaves,’ like these:
• …and meat loaves
are not for the unsophisticated alone. ... Three recipes for distinguished meat loaves
are listed on this page. ...
• In recent years, I have been making all sorts of meat loaves
and patties with various combinations of veal, beef and turkey. The recipe below has many ...
This would be enough for me to think ‘meat loaves,’ except for this passage in The Language Instinct*, by Steven Pinker, a respected and famous linguist. The Grammar Exchange has this thread on plurals which do not follow the usual form for irregular usage:http://thegrammarexchange.info...706068462#1706068462
Pinker notes ‘Toronto Maple Leafs’ and ‘low-lifes’ as plurals, which makes me think that the plural of ‘meat loaf’ would be ‘meat loafs.’
Anyway, I think this is yet another phrase which can have differing plural forms, either meat loafs
or meat loaves
_______ *The Language Instinct, How the Mind Creates Language, by Steven Pinker.William Morrow and Company. 1994