Not really useful tame, but they don't do any damage unless they push you off a cliff. Their attacks are all pushing, no damage. Awesome giant walking prime meat machines to kill and harvest when you are taming something useful. Or tame one and name it the Magic School Bus and drive you and your entire tribe off a cliff into the Volcano.
Good tanks for raids! Use as a frontline attack in front of Brontos or Gigas etc, can push tames back when attacking so you can use this for defence too. Their high speed allows you to run from turrets when on low health. Worth it when passive tamed as the low kib needed means you can tame more.