Google recently released a coloring book that mentions the Pixel 6a. This comes before any official announcement or mention from the company. The unannounced device is listed under featured products in the colors with Google coloring book that includes the Pixel 6, Nest Hub, and Pixel A Buds.
The table of contents reveals that you can color in the Nest Thermostat and the 6a on pages 6-7. However, the Nest Hub and Nest Audio appear on the actual pages 6 and 7, respectively.
Although if we base it on previous renders of the 6a, it might be actually hard to tell the vanilla Pixel 6 as the unreleased device appears to be just a smaller version. Because of this, the device in the coloring book could actually be the 6a, assuming the renders are to be believed.
The Pixel 6a is believed to debut in May with a 6.2-inch OLED panel with a pair of 12MP sensors but the same Tensor chipset.
Oh, if you were interested in coloring in some Google devices, you can do so digitally here.