An avocado
There are many types of balls that come in all shapes and sizes, for example, the ones we use for bowling, football, basketball, baseball, and so on. Even apart from sports, there are balls for cheese, chocolate, and meat. But never have we heard of one used for a snack, let alone to refer to an avocado.
Congratulations sir, you’ve thought of something that no one else would even dare to come up with, a guacamole ball. But we think we should leave this dad alone, he probably had a busy work day and just couldn’t be bothered to remember its proper name. Don’t worry dad, just keep doing you and putting food on the table.