The first one is No Worries which tell how Simba, Timon and Pumbaa go to find a new home since they're too lazy to clean up, Hakuna Matata as Timon say.
No Worries
Then Friends in Need, I'm sure many of you are familiar with the title. Also for liking the story since it has young Mufasa.
Friends in Need
I also found Morning in the Pride Lands which seem to be aimed at very young children since there isn't a lot of text. The pictures resemble the opening of the film.
Morning in the Pride Lands
A small book called Simba's Hide and Seek. I have to admit that Simba looked like Kopa for a fragment of second in the page with the ostrich.
Simba's Hide and Seek
The last one is a little book of opposites called Simba and Nala At Play: A Book About Opposites
Simba and Nala At Play: A Book About Opposites
I don't know about you but I enjoyed to read these little stories.
If you find any books feel free to link them here. 
It's funny... Timon is too lazy, lol
I have the first one, loved it when I was little!
