The best replacement for iguana is bearded dragon.

The best alternatives to iguana are rated as following:
★★★★★  bearded dragon
★★★★★  lizard
★★★★  chameleon
★★★  tegu
★★  chinese water dragon
★★  cat
★★  gecko
★  water dragon
★  savannah monitor
★  monitor lizard
★  mirth
★  frilled lizard
  green iguana
  leopard gecko
  forest chameleon
  goanna
  chuckwalla
  kitten
  iguana

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

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



Google Trends

Scale is based on the average worldwide traffic of iguana in all years. Click on graph for more.
iguana
bearded dragon
lizard