The best replacement for iceberg is romaine.

The best alternatives to iceberg are rated as following:
★★★★★  romaine
★★★★★  glacier
★★  romaine lettuce
★★  green leaf lettuce
★  titanic
★  iceburg
★  ice floe
★  packages
★  romaine nutrition
★  iceberg mini
★  vortex
★  cosmos z
★  romaine lettuce nutrition
  young fi
  lettuce
  a919i
  packagemaker
  iceberg
  myphone vortex
  omega xl
  vkool
  cherry mobile cosmos
  arugula
  cos lettuce
  head lettuce
  red lettuce
  romaine lettuce better

Your alternative for iceberg is not listed? Suggest!
Speaking about iceberg, one probably shouldn't forget about titanic.

Other search terms related to iceberg and their ratings are:
★★★★★ titanic
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Google Trends

Scale is based on the average worldwide traffic of iceberg in all years. Click on graph for more.
iceberg
romaine
glacier