Make the sauce by combining the peanut butter, coconut milk, lime juice, soy sauce, maple syrup, ginger, garlic, and 2 tablespoons water in a small bowl. Set aside.
Skin the mangoes and slice the flesh into strips.
Skin the avocados and slice the flesh into strips.
Add hot water to a shallow pan or pie plate.
Submerge a spring roll wrapper in the water for about 10–15 seconds, until it softens, then lay it on a work surface.
Layer in rice, mango slices, avocado slices, and purple cabbage.
Bring in the sides and roll up the wrapper like a burrito. Repeat steps 5–7 with the remaining spring rolls.
Place the spring rolls on a platter and serve with the prepared sauce.