For the sweet lörtsy you can use any Lihapiirakka recipe, but shape it flatter, replace the filling with apple jam and cover the whole thing in sugar at the end. The finished result should be floppy, the name kind of indicates that too.

The savory version uses meat, but I found this with a quick google-fu. You can probably use the same dough for the sweet Lörtsy.

https://www.soppa365.fi/reseptit/kasvis-vegaaninen/lihattomat-lihapiirakat

As for the blueberry pie (eat with vanilla ice cream/vanilla sauce of some kind): https://pakkopulla.vuodatus.net/lue/2007/04/ruis-mustikkapiiras

A couple of things to note: Nordic "blueberries" are actually bilberries, which are more tart and more ibtense flavoured compared to the blueberries grown in the US, but those should still be good enough :) (https://youtu.be/8zcQyWeZtX4)

Butter here is basically always salted, so use a bit of salt in the recipe if you use unsalted butter.

Here's a couple of pretty common resources for traditional recipes, search is your friend.

https://www.valio.fi/keittion/

(Search by vegan) https://www.valio.fi/reseptihaku/?haku=vegaani

https://www.k-ruoka.fi/reseptit