A few years back, my brother and his family gave Jackson a collection of Frog and Toad stories and as the title suggests, they're about two friends - a Frog and a Toad. One has a sunnier disposition than the other, but to be honest with you, I always get them confused. They're kind of like the amphibious Odd Couple.
The stories cover a number of topics like being alone, procrastinating, waiting for a letter, wearing a silly swimsuit, etc, and are accompanied by wonderful illustrations.
If you're looking for a bedtime, or really anytime, read you can't go wrong with Frog and Toad