Only new myself so welcome aboard. I guess the experts have answered this question a million times or more. You will find its a great place to equate knowledge. You are correct 100% that the spiderlings are referred to as slings.
of course it could be scorplings lol
depending on context lol
then there are plings which could be centipede or millipede babies lol
then terms such as OBT lol and the infamous 1.2.2000 (I think thats close to Ryans B. smithi lol)