The best replacement for crawl is slab.

The best alternatives to crawl are rated as following:
★★★★★  slab
★★★★★  breaststroke
★★★★  freestyle
★★★★  creep
★★  slab foundation
★★  basement
★  nethack
★  freestyle stroke
★  sit first
★  slither
★  backstroke
  angband
  scoot
  jump
  front crawl
  tome
  freestyle swimming
  trudgen
  bar hopping

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Google Trends

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crawl
slab
breaststroke