Is there a way to transform "found" to stand for "things which have been found"?
I can think of use discoveries as the things which have been found. Is there a way to do that by transforming the word found? Like we can say "things which belong to you" as "your belongings".
Solution 1:
This depends on the context:
findings usually refers to things found through investigation:
finding n. A conclusion reached as a result of an inquiry, investigation, or trial
discoveries implies either facts that one has become aware of, things found by accident or chance, or things found as a result of a process (such as oil discovered by exploration)
discover v.
Find (something or someone) unexpectedly or in the course of a search
Become aware of (a fact or situation)
discovery n. A person or thing discovered
find can be used as a noun in some contexts:
find n. (pl. finds) A discovery of something valuable, typically something of archaeological interest
None of these words would really be appropriate for things found in the normal course of life, for example I keep a shoebox of interesting things I have found on the ground out-and-about. It would not really be correct to call them my findings, nor my discoveries, things I found is probably the best word / phrase to use in this context.
Solution 2:
For things, findings is the correct word, especially in research.
For abandoned children, the word is foundling
Solution 3:
Try findings. The infinitive for "found" is "find", thus word "findings" is probably what you are looking for.