Found this hard, foam-like brown structure attached to a fence post in the backyard. I was about to scrape it off but hesitated. What is it?

Found this hard, foam-like brown structure attached to a fence post in the backyard. I was about to scrape it off but hesitated. What is it?

🕷️ How to Tell It Apart from a Wasp Nest

Feature
Praying Mantis Ootheca
Paper Wasp Nest
Shape
Solid, oblong foam mass
Open honeycomb cells under a papery dome
Surface
Rough, bubbly, uniform
Smooth gray paper with visible holes
Activity
No insects coming/going (dormant in winter)
Wasps flying in/out (if active)
Season
Laid in fall; hatches in spring
Built in spring/summer; abandoned by winter

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