The best replacement for giant squid is whale.

The best alternatives to giant squid are rated as following:
★★★★★  whale
★★★★  colossal squid
★★★★  sperm whale
★★★  octopus
★★★  mega shark
★★  blue whale
★★  giant octopus
★★  great white
★★  megalodon
★  killer whale
★  kraken
★  white whale
★  great white shark
★  sperm whale youtube
  giant shark
  humboldt squid
  jaws
  colossal
  an octopus
  whales
  octopi

Your alternative for giant squid is not listed? Suggest!
Speaking about giant squid, one probably shouldn't forget about sperm whale.

Other search terms related to giant squid and their ratings are:
★★★★★ sperm whale
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Google Trends

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giant squid
whale
colossal squid