We Bare Bears In Minecraft!

 Griz
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Grizzly Bear\"}"},SkullOwner:{Id:"cc2703de-c831-4706-a985-d6cbb639337d",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYTlhMjI5MDQzODYxNDEwN2U4OGRjZmJlMzMzZDY4Y2MzNGMzYmEzNDAwZjMzNmY1MWRmMDM0MjI0M2VlODVhNiJ9fX0="}]}}} 1
 Panda
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Panda Bear\"}"},SkullOwner:{Id:"461975a4-5ad1-4a89-8c67-c24a676ebad1",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvY2NhM2JiNWI3OGM3MzMyYzQ3MWI3NzY5MjA4ZDY3MjFmOGRiZWM5YjE3NDM3Njk5NTdmNDUyZjU5YTYwMGVhZiJ9fX0="}]}}} 1
 Ice Bear
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Ice Bear\"}"},SkullOwner:{Id:"95031e25-f8e2-4546-b1fd-df412a6fb055",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMTllNjljNzI1MzE2NTVhNGI2OTdmMzliNGFlOGFkYzRjMTc4MGMyNjM3MWU1MzQ4MzI4MDAzZGMzMjE5ODczYyJ9fX0="}]}}} 1
Alternatives:
 Brown Bear
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Bear\"}"},SkullOwner:{Id:"16a37715-3d58-407c-87f8-c18c1198ea6d",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMmRmZTcwOWRhMmNmMzJlMWUyNzNmNWQ3MmM2NmZjMzZkYzY0MzY2ZmVjZDk4MGFhNmIxNDgwZDc5YmM2NGNkNyJ9fX0="}]}}} 1
  Panda Bear
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Panda Bear\"}"},SkullOwner:{Id:"037eade6-2fc5-4eca-a0ae-a1b54239cd34",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODAxOGExNzcxZDY5YzExYjhkYWQ0MmNkMzEwMzc1YmEyZDgyNzkzMmIyNWVmMzU3ZjdlNTcyYzFiZDBmOSJ9fX0="}]}}} 1
 Polar Bear
/give @p minecraft:player_head{display:{Name:"{\"text\":\"Polar Bear\"}"},SkullOwner:{Id:"6dee290a-211f-4362-b8f9-a2b852428bd1",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZjA3MmQ4Y2I4Mzk1YzJiYzg0NTQ3ZTZhYzliOGVkZWVkNzhjODY1OGMwZWQxYjg4M2M2MjljM2E3ZTkwIn19fQ=="}]}}} 1

I got an organized all of these from https://minecraft-heads.com/