The best replacement for acorn is butternut squash.

The best alternatives to acorn are rated as following:
★★★★★  butternut squash
★★★★  pixelmator
★  buckeye
★  hazelnut
★  mosaic
★  kgb
★  conical
★  stannah
★  esprima
★  sketch
★  amy rose
★  buttercup squash
  eggcorn
  chestnut
  pine cone
  oak tree
  kabocha squash
  pixelator
  naca

Your alternative for acorn is not listed? Suggest!
Speaking about acorn, one probably shouldn't forget about oak leaves.

Other search terms related to acorn and their ratings are:
★★★★★ oak leaves
You have in mind a companion for acorn and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of acorn in all years. Click on graph for more.
acorn
butternut squash
pixelmator