The best replacement for liquid nitrogen is dry ice.

The best alternatives to liquid nitrogen are rated as following:
★★★★★  dry ice
★★★★  liquid helium
★★★  lava
★★  liquid oxygen
★  hand
★  thermite
★  liquid hydrogen
★  anhydrous ammonia
★  nitrous oxide
★  liquid co2
  watermelon
  anhydrous
  dry ice temperature
  aldara

Your alternative for liquid nitrogen is not listed? Suggest!
Speaking about liquid nitrogen, one probably shouldn't forget about ice cream.

Other search terms related to liquid nitrogen and their ratings are:
★★★★★ ice cream
You have in mind a companion for liquid nitrogen and it is not yet here? Propose!



Google Trends

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liquid nitrogen
dry ice
liquid helium