Add the softened cream cheese to a large bowl. Shred the imitation crab and add it along with the garlic and scallions.
Add soy sauce, sugar, sesame oil, garlic powder, and white pepper. Mix until the filling is evenly combined.
Place the wonton wrappers on a work surface and keep the remaining wrappers covered with a damp towel. Lightly wet the edges of each wrapper with water.
Place about 1 tablespoon of filling in the center. Fold the wrapper into a triangle and pinch the edges firmly to seal, pressing out excess air. Repeat with the remaining filling.
Heat the oil to 350°F. Fry the rangoons in small batches for about 2 minutes per side, or until lightly golden and crisp.
Transfer to a wire rack or paper towel-lined baking sheet to drain. Sprinkle lightly with kosher salt.
Serve immediately with sweet chili sauce for dipping.