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The "frame" orresponds to a link (reference frame) in your robot, not the output topic of the node. To remap, use the <remap> tag:

  <node pkg="robot_pose_ekf" type="robot_pose_ekf" name="robot_pose_ekf">
    <param name="freq" value="10.0"/>
    <param name="sensor_timeout" value="1.0"/>
    <param name="odom_used" value="true"/>
    <param name="vo_used" value="false"/>
    <param name="imu_used" value="true"/>
    <param name="debug" value="false"/>
    <param name="self_diagnose" value="false"/>
    <remap from="imu_data" to="/rrbot/imu_data"/>
    <remap from="odom_combined" to="odom"/>
  </node>

The "frame" orresponds to a link (reference frame) in your robot, not the output topic of the node. To remap, use the <remap> tag:tag.

Update: After your clarification, I suggest renaming the frame and output topic with the output_frame parameter and then using remap change the topic back to odom_combined:

  <node pkg="robot_pose_ekf" type="robot_pose_ekf" name="robot_pose_ekf">
    <param name="freq" value="10.0"/>
    <param name="sensor_timeout" value="1.0"/>
    <param name="odom_used" value="true"/>
    <param name="vo_used" value="false"/>
    <param name="imu_used" value="true"/>
    <param name="debug" value="false"/>
    <param name="self_diagnose" value="false"/>
    <remap from="imu_data" to="/rrbot/imu_data"/>
    <param name="output_frame" value="odom"/>
    <remap from="odom_combined" to="odom"/>
from="odom" to="odom_combined"/>
  </node>