JLegzanswered grow question 4 years ago I cannot say i have ever seen these cute "seedling helpers"; However, there are better solutions for this problem.
Plants only stretch up like this when they are not getting enough light and there is very little airflow moving the plant. Lowering the light will reduce stretching,
It also seems like these plants started in their final container. If these seedlings had started in smaller containers, they could be transplanted into larger pots and placed deeper into the hole as to cover more of the stretched stem.
this will help to support the lanky stem and any part of the stem that is covered in moist soil will also begin to shoot off roots!