After talking with a lot of people, it seems everyone had some difficulty finding 85. The original description for it wasn’t the greatest either.
Hope this helps.
(#85) 6-10 Normal, Wave 1, Frontline, move to the right, and destroy the bench off in the distance to your left. Once the bench is destroyed, you will see a oil drum, destroy that. The pumpkin is hard to spot, but it’s inside of it.