The best replacement for crawler is spider.

The best alternatives to crawler are rated as following:
★★★★★  spider
★★★★★  scraper
★★★★  fleetfoot
★★★  scaler
★★★  dozer
★★★  holy diver
★★  ibookshelf
★  comp crawler
★  photon cannon
★  trail trekker
★  trepador
★  trail gear
★  bot
  axial scx10
  ax10
  night crawler
  axial ridgecrest
  axial wraith
  robot

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Google Trends

Scale is based on the average worldwide traffic of crawler in all years. Click on graph for more.
crawler
spider
scraper