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I was able to get it working!

class ScatterTrees extends Sup.Behavior {
  trees = [];
  treeCount = 50;
  
  start() {
    for (var i = 0; i < this.treeCount; i++){
      Sup.appendScene("Plants")[0].arcadeBody2D.warpPosition(Sup.Math.Random.float(-5, 5),Sup.Math.Random.float(-5, 5));
    } 
  }

  update() {
  }
}

Sup.registerBehavior(ScatterTrees);