When I use the shortcut F3+H to display the id's of the blocks, items, etc, the game crashes, the crash report indicates that it is a problem with the mod.

https://pastebin.com/PtQfXPN7

If you're using some sort of Forge version of the Fabric API to get Frostiful to work on that platform, the crash report indicates that for some reason they pass an immutable map to the ModifyItemAttributeModifiersCallback event. This is not the documented behaviour for Fabric API and an issue on their end, not mine.

That log looks like you are using Forge... can you confirm that this is on Fabric?