Singing childrens songs is great fun. When we got "Let's sing" by Alice Tegnér we had no idea what nice songs awaited us. Well we should've known since this is the songbook that we all sang from in school. I also know my parents had this book in school in the 40's-50's (Published in 1943 by Liber).
Now, for some reason one would think that every now and then an editor would go through the book and look through the material.
But it's very evident that they haven't. The edition we have is from 2000, and no changes has been made. As you can see in the images below from spread p. 42-43. A nice song about "The Crocodile Family"
Click to enlarge.