The best replacement for polar bears is penguins.

The best alternatives to polar bears are rated as following:
★★★★★  penguins
★★★★  grizzly bears
★★★  brown bears
★★★  kodiak bears
★★  killer whales
★  black bears
★  bears
  pandas

Your alternative for polar bears is not listed? Suggest!
Speaking about polar bears, one probably shouldn't forget about huskies.

Other search terms related to polar bears and their ratings are:
★★★★★ huskies
★★★ global warming
You have in mind a companion for polar bears and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of polar bears in all years. Click on graph for more.
polar bears
penguins
grizzly bears