Already has been suggested, just putting it here so it's not forgotten.

Essentially, make the Giant Roots' textures the tentacle texture during the Spook event.

Also still can't add labels sorry

This can be done in the assets, you can look at some other spoopy blocks like cattail, logs etc. for reference

https://github.com/Angry-Pixel/The-Betweenlands/blob/1.12/src/main/resources/assets/thebetweenlands/blockstates/cragrock.json

You need to accept the invite, lol

Well I’m stupid