Those aren't limited to toys and they also belong to a whole set of assistive tools. Wikipedia has them under the name reach extender but also lists off "reacher, grabber arm, helping hand, trash picker, picker-upper, extended gripper, long arm gripper, extended reach grabber, grabber tool, caliper etc" as additional names.
Magic hand is also really ambiguous naming which is why we're getting posts like post #5227267, post #2949156, post #1481509 under the tag. It would probably be worthwhile renaming the tag instead of continuing to use the term "magic hand" for them. My own suggestion would be using the term "grabber tool," particularly since the bulk are from the series Working!! and that one is the tool version (post #877075) instead of the toy version (post #5363286).