The best replacement for puffer fish is blowfish.

The best alternatives to puffer fish are rated as following:
★★★★★  blowfish
★★★  porcupine fish
★★  balloon fish
★  eel
★  boxfish
  fugu
  lionfish
  pufferfish
  dogface puffer fish

Your alternative for puffer fish is not listed? Suggest!
Speaking about puffer fish, one probably shouldn't forget about cichlids.

Other search terms related to puffer fish and their ratings are:
★★★★★ cichlids
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Google Trends

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puffer fish
blowfish
porcupine fish