According to Android Police, the codenames for the 2017 Pixel devices are “Muskie” and “Walleye”. Walleye being the Smaller Pixel device while Muskie will be the larger one. Confirming the codename, Walleye has already made its way to the AOSP gerrit.
2017 Google Pixel Phones to be codenamed “Muskie” and “Walleye”
by Vaibhav Jain on March 15, 2017