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Put the popped popcorn and pretzels in large bowl or pan; set aside.
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In heavy saucepan, heat butter and marshmallows on low heat, stirring constantly, until melted and smooth. Add nutella and quickly stir to incorporate.
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Pour mixture over popcorn and mix carefully until popcorn is well coated. Press into balls using the popcorn ball. Once shaped, set on wax paper.
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If you are making a football shape, melt white chocolate in 30 second intervals in the microwave. Once melted, spoon into a zip top bag. Snap a small corner off the bag and pipe the white chocolate onto the popcorn balls.