I finally managed to crack open the graphics files from the new Nintendo leak and guess what - BS Zelda prototype tiles! This includes
-Lanmolas and Gleeok!
-Prototype Dodongo, Digdogger and Moldorm designs
-Prototype Zora/Leever emerging/submerging effects
-Prototype Ganon design
-4 directions for Pols Voice

These palettes are assumed since there is no actual game that these tiles are used in. I assume the Lanmolas will use CSet 7/8, the Pols Voice their usual CSet 8, CSet 7 for the tidepool-esque effect, and the Digdogger, Moldorms, Dodongos, and Ganon their usual brown palette (CSet 10 in NewBS). I had to make a guess for Gleeok - I chose CSet 7 since it's the only enemy CSet that has green in it.

Nintendo
The leaker(s)