Put 4 ounces chocolate in a medium bowl.
Bring 1/2 cup heavy cream to a simmer and pour over the chocolate.
Let sit 5 minutes.
Add vanilla and salt.
Stir smooth and let cool.
Put the remaining 1 cup heavy cream, confectioners' sugar and peanut butter in a large bowl.
Beat on medium-high speed until stiff peaks 3 minutes.
Fold the peanut butter whipped cream into the cooled chocolate mixture in three batches.
Freeze until the mixture is firm enough to scoop, about 30 minutes.
Scoop balls of the frozen mousse onto a parchment-lined baking sheet.
Insert lolli sticks and freeze.
Melt in the microwave the 8 oz chocolate you still have and oil.
Dip pops and sprinkle with the nuts.
Store in freezer.