Peel and pit avocados. In a bowl, coarsely mash avocados; fold in onion, jalapenos, cilantro, lime zest and juice, salt, pepper, and garlic.
Line an 8-inch square baking pan with wax or parchment paper. Spoon avocado mixture into pan; spread into an even layer. Place another sheet of parchment on top; freeze until solid, 6 to 8 hours.
At least 30 mins before serving, in a small shallow bowl, beat eggs with 3 tablespoons water.
Remove avocado mixture to a cutting board; cut into small cubes. Dip each cube in flour, then egg wash, breadcrumbs, and again in wash and breadcrumbs. Arrange in a large baking pan; cover and return to the freezer until firm, 20 to 30 minutes. (You can leave these overnight in the freezer if you want to have the prep work done ahead of time.).
When you are ready to cook these, in a deep skillet or pot, heat oil to 350°F Fry frozen guacamole bites in batches until golden; drain on paper towels.
Serve immediately sprinkled, if desired, with kosher salt. :-).