Stir together the jicama, clementine or orange segments and juice, lime juice, if desired, red onion, cilantro, chile, and salt. (If using lime juice, aim to use half as much lime juice as orange or clementine juice.) Set aside.
Cook the scallops
Heat a large, heavy skillet over medium-high heat until hot. While the skillet is heating, pat the scallops dry with paper towels and season them with salt. Add the oil to the skillet and swirl to coat the bottom. Immediately add the scallops, one by one so they aren’t touching, and cook, without moving, until the undersides are browned, 2 to 3 minutes. (When the scallops are ready, they will move when you shake the pan or nudge them with a metal spatula because their browned crust will release them from the pan.) Flip the scallops and sear on the other side until just cooked through, 1 to 2 minutes more, depending on the size of the scallops.
Assemble the tacos
Add the chicharrones, if using, and peanuts to the pico de piñata. Cut the scallops into 1/2- to 1-inch pieces. Pile the scallops and pico de piñata on the tortillas. Serve with the lime wedges for squeezing, if desired.
Shrimp Taco Variation
Substitute 1 pound popcorn shrimp for the sea scallops. Season with salt and sauté, stirring, until just cooked through, 2 to 3 minutes.