Frostbite

Frostbite is an obstacle, used as the third obstacle in the Winter Wipeout Zone of Season 4, replacing both the Triple Threat and the Sinistairs from the previous season.

It is two slowly rotating planks contestants must cross while avoiding four sets of giant icicle teeth moving in the opposite direction. The center pillar has a wide ledge that wraps around it, which links the two planks together. Each icicle set has a different configuration with some having gaps that they can slot through.

Only five contestants cleared this obstacle on their first attempt with three of them from the same episode:

Tiffany Saenz (S4E2)
Erick Granados (S4E2)
Jason Ondo (S4E2)
Jacob Chrisman (S4E3)
Walter Walker (S4E5)

Coincidentally, the latter three later won their respective episodes.

It was replaced by Point Break when the season moved on to Spring Wipeout.