From Zelda Legends Wiki
Apples fall from some trees if you charge into them, and give you some health back.
DescriptionPegasus Boots, in some occasions like the lone tree visible on the screenshot drops some apples. These red apples fall from the tree in groups of four to seven or so pieces, they have the same effect as one would pick up a Recovery Heart.
Sometimes an Apple restores more than one Heart Container, this might be because two apples are lying on the exact same spot. Or it could be that some apples just give you more energy than others.
A Link to the Past (GBA only)
Q. Bumpkin's 9th riddle:
"It's shiny and sweet...what is it?"