Is Redwood Savanna?? in the bedrock edition, there's a biome called "The Shattered Savannah Biome" I like it the most because the grass is so green and the mountains and hills look amazing and peaceful.
So a texture pack retextures every block, item, mobs, etc. While Skin packs are something you can use to transform into that skin for example Custom skins. I believe this is a texture pack, not a skin pack. so I can help you fix it if you want to retexture chickens. just tell me what version of Minecraft bedrock are you playing on.
Well actually you can but you will have to rename every single png, also there would be missing stuff in there and it would look like a weird-looking block, item, mob, mainly because it's not in Java format you will have to edit it.
You can try using the java edition of PureBDcraft then rename them to bedrock form names, for example, the Acacia Doors in Java edition are named acacia_door_bottom and acacia_door_top. so rename them to this door_acacia_lower and door_acacia_upper and it should work.