Boil the plantains. Peel the plantains and cut them into 1/4-inch thick coins. Place in a saucepan, cover them with cold water, add salt, bring to a boil, and then reduce heat to simmer. Cook until a fork easily slides in and out when you poke a piece of plantain, about 10-15 minutes.
Prep the flavorings. While the plantains simmer, peel and crush the garlic and place in a mixing bowl. Place the pork rinds in a large ziplock bag and crush with a rolling pin or the bottom of a ramekin to make pork dust. Add to the mixing bowl.
Sauté the plantains. When the plantains are tender, drain them and set aside. Place 4 teaspoons cooking fat in a large, non-stick skillet over medium-high heat, 2 minutes. Add the plantains and sauté, tossing occasionally with two wooden spoons, until they’re yellow color deepens, but don’t let them brown. When they’re a darker, golden yellow, transfer them to the mixing bowl, along with any fat remaining in the pan.
Mix the mofongo. With a potato masher or an electric mixer set on medium, gently mash the plantains and pork rinds together. You want some bumpy texture, rather than a smooth paste. Add about additional fat, 1 teaspoon at a time, to help the mofongo stick together; it shouldn't be dry. Taste and add more salt, if necessary. Using moistened hands, form into 3-inch balls or mound on a plate; serve warm.