The best replacement for teal is turquoise.

The best alternatives to teal are rated as following:
★★★★★  turquoise
★★★★  aqua
★★  cyan
★  jade
★  turquoise color
★  aquamarine color
★  aquamarine
  tiffany blue
  aqua color
  mallard
  no teal
  ronon
  connecticut
  wood duck
  agua
  sonia kashuk taunting teal
  salmon

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Speaking about teal, one probably shouldn't forget about other colors.

Other search terms related to teal and their ratings are:
★★★★★ other colors
what color
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Google Trends

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teal
turquoise
aqua