I've never heard of using frozen zucchini in a shake, but I like the concept. (cricketsconfections.com)
Typically I use frozen bananas to thicken smoothies, but I wanted to keep the sugar content down given I'm sick and went with frozen zucchini instead. (pumpsandiron.com)
I even used frozen zucchini that we had from last year's garden, so I wasn't sure the texture would be great... but to my surprise, it turned out excellent. (wellnessmama.com)