The plush toy in the image is a

Squash Mos Monster

, specifically a purple one-eyed variant with yellow horns. These round, soft toys are designed to be squishy "monster buddies". 

While very similar plushies are sometimes sold as dog toys under the name "Rock Monster" by brands like Zanies or MPP, the specific design with many small suction-cup-like feet matches the

Squash Mos

brand. 

You can find similar one-eyed monster plushies from various retailers and brands: