grape
Buttered popcorn is the most popular in the US.
Well, it's jelly beans, and still is.:) But I'm assuming you meant their most popular flavor. It's Very Cherry, except from 1998-2002, when it was buttered popcorn, believe it or not! (It's on their website)
poisonberry Its POISON!
The most popular fruit flavor for ice cream is strawberry.
The most popular Tootsie Roll flavor among candy enthusiasts is the original chocolate flavor.
red
red
red
The most popular green popsicle flavor among children is typically lime.
Apple
Coconut
The most popular flavor of gum in the 90s was likely fruit-flavored gum, such as strawberry, watermelon, or grape.