Probably, but this leads down the rabbit hole on "what counts as discontinued". There's probably plenty that got killed internally before seeing a public user. Some on the Wikipedia list were more like features within a product (e.g. Latitude), some of them just morphed into products directly (e.g. real-time search, I think), and some of them were not really in a 'launched' state (e.g. Image Swirl).
https://en.m.wikipedia.org/wiki/Category:Discontinued_Google...
...and I suspect there’s many that aren’t listed at Wikipedia.