Here is just a list of resources, most dedicated to translating between Platt and Hochdeutsch.

Online Dictionaries

https://deutsch-plattdeutsch.de/index.php/worterbuch/

https://www.platt-wb.de/

https://www.ndr.de/kultur/norddeutsche_sprache/plattdeutsch/woerterbuch101.html

Pocket Dictionary

https://www.goodreads.com/book/show/20798597-plattd-tsch---das-echte-norddeutsch

Duden, but for Platt

https://www.goodreads.com/book/show/8977502-der-neue-sass-plattdeutsches-w-rterbuch

PDF of Dictionary

https://www.ostfriesischelandschaft.de/fileadmin/user_upload/BIBLIOTHEK/Dokumente/Buurman/01.pdf (Replace the 01 to get other volumes)

Hoch <> Platt Translator

https://www.översetter.de/

Various Novels, Translated Classics, Märchen (All Available on Amazon, but not Digitally)

https://www.goodreads.com/book/show/10949684-alice-ehr-event-rn-in-t-wunnerland

https://www.goodreads.com/book/show/9097641-de-eensam-hude

https://www.goodreads.com/book/show/36823633-till-ulenspegel-op-platt

https://www.goodreads.com/book/show/60304834-keen-utweg

https://www.goodreads.com/book/show/60300705-keerlke---en-gang-d-r-en-kinnerland

https://www.goodreads.com/book/show/18194711-plattdeutsche-volksm-rchen

https://www.goodreads.com/book/show/41608063-klaus-groth-s-gesammelte-werke

https://www.buch24.de/shopdirekt.cgi?sessionid=1646864785-319185763&id=32373839&p=3&sid=&static=0&nav=

Super, sehr interessant! Danke!