The Wug Test

Buy the Book! The complete Wug Test is now available in a spiral bound book, perfect for sharing with children aged 4-7! See the Wugs, Gutches and Kazhes that started it all!

The Wug Test is a picture book for children and adults that uses invented nouns, verbs, and adjectives to illuminate what children know about their own language. This book includes the original delightful Wug Test drawings and test questions created by Professor Jean Berko Gleason in 1958. The Wug Test, first given in research settings, showed that children do not learn language simply by memorizing what they hear. Instead, they learn the rules of their language so that they are able to make plurals, past tenses and other forms when presented with words they have never heard before. This book has pictures and interesting questions to share with children, along with informative notes and commentary for adults. It provides a fascinating insight into what even very young children know about language, as well as a way to understand and observe a child's acquisition of the rules of language over time.

Available now on Amazon for $14.99

Wug Mugs

Buy your official 11 ounce Wug Mug here! Our store sells authorized Wug Mugs from Jean Berko Gleason's original designs.

Man Who Knows How to Spow

Buy your official 15 ounce Man Who Knows How to Spow mug here! This enigmatic image is number three in the famous Wug Test created by Jean Berko Gleason.


We have official This is a Wug T-shirts in various styles for men, women and children. Sweatshirts and ladies' tanks too.

Key Chains, Charms and Necklaces

Official This is a Wug keychains, silver charms and necklaces. The perfect accessory for every linguist and Wug lover.

Baby Clothes

If there is anything cuter than a Wug, it must be a baby in a Wug inspired outfit. Clothing for the smallest Wug lovers is here!

Dog Clothing and more!

Show your love of all things Wug wherever you go!  Dog clothing, laptop skins, smart phone cases and much more!