The best replacement for scallion is green onion.

The best alternatives to scallion are rated as following:
★★★★★  green onion
★★★  shallot
★★  onion
★★  leek
★★  chives
★  chive
★  spring onion
★  leek kershaw
★  chive kershaw
★  yellow onion
★  scallop
  sog flash
  leek most like a sweet onion

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green onion