That is usually called a rubber spatula, even though they're rarely made of rubber. The ones I find most useful are made of silicone, and are heatproof. This one by OXO is one of my favorite gadgets.
They're for stirring and for clean scraping bowls and jars and such. The heatproof ones are great for use with non-stick cookware while sauteing.
Best Answer
Following Lorel C's idea, I searched a bit for "patent" "kientz" and "foot massager", and found the patent for this device - https://patentimages.storage.googleapis.com/3b/09/3c/f580058fba56fc/USD243557.pdf
Short answer - yes, it's a foot massager.