Recipe calls for Tapioca pudding - none to be found!
I've seen recipes that does not use tapioca pudding (just jello and vanilla pudding)
The final consistency will not be the same, but it should work.
https://parade.com/841414/kristamarshall/popsicle-in-a-bowl/
https://www.madetobeamomma.com/creamsicle-fluff/