Hi vientoverse,
They are .png animation sheets, similar to how the animations are done for SGB, in the form of frame by frame, or how animations are done in Rpg Maker earlier series before MZ. I'm NOT sure if these will work in the regular way for Bakin as Bakin's animations are Effekseer animations and these are animations made in .png sheets.
The larger animation sheets are split up into 2 or 3 parts, as SGB dont like long animation sheets, this was done with the SGB function in mind that you can use 3 different sheets for 1 animation. (the video on the right shows this feature/function.
However, don't quote me on this but there may be ways to use them in Effekseer to turn them into .efk animations..? I've really no idea to be honest, it's the same with importing the sheets into Bakin and trying to use them within the frame animation function in Bakin, it might work then it might not.
I DID just do a quick search for converting from 2D animation sheet to Effekseer on Google and found this.. so it is possible to convert them from .png sheet format to the format Effekseer Bakin uses.
https://www.reddit.com/r/RPGMaker/comments/ierp0n/using_spritesheets_for_animati...
Will it work though..? i'm not entirely sure, i've not tried and tested it. I DO however know you need a specific Effekseer version and also need to export it as a specific effekseer extention. IF you decide to try convert them to effekseer for use in Bakin please let me know how it went.. i'm interested to know if it worked or not, and maybe others looking to buy this pack too.
Hope this helps!