UPDATE: I went searching for this blog post August 25, 2021... my youngest child is six and these books popped back into my head as being perfect. He loves Flicka, Ricka, and Dicka already. He doesn't even know about Snipp, Snapp, and Snurr! This will be so fun!
It looks like there were originally 10 books in each series. Some are out of print. They are now rare and very expensive. Your best bet is eBay.
Flicka, Ricka, Dicka and the Strawberries
Flicka, Ricka, Dicka and the New Dotted Dresses
Flicka, Ricka, Dicka and the Little Dog
Flicka, Ricka, Dicka and Their New Skates
Flicka, Ricka, Dicka and the Three Kittens
Flicka, Ricka, Dicka Go To Market
Flicka, Ricka, Dicka Bake a Cake
Flicka, Ricka, Dicka and the Big Red Hen
Flicka, Ricka, Dicka and Their New Friend
Flicka, Ricka, Dicka and the Girl Next Door
out of print
Snipp, Snapp, Snurr and the Gingerbread
Snipp, Snapp, Snurr and the Red Shoes
Snipp, Snapp, Snurr and the Yellow Sled
Snipp, Snapp, Snurr and the Buttered Bread
Snipp, Snapp, Snurr and the Big Surprise
Snipp, Snapp, Snurr and the Reindeer
Snipp, Snapp, Snurr Learn to Swim
Snipp, Snapp, Snurr and the Seven Dogs
out of print
Snipp, Snapp, Snurr and the Magic Horse
out of print
Snipp, Snapp, Snurr and the Big Farm
out of print
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