Claymorphism is a UI design style, coined by Michal Malewicz from Hype4.Academy as a response to the growing popularity of inflated, fluffy 3d shapes and artwork in user interfaces. By categorizing it and giving it a common name, it became easier to find and learn about it from resources all around the web.

After the initial article, written in December of 2021, the trend is further explored and more articles and tutorials will come soon. You can read the original article, at the academy as well.