To give more context to what KittenKatja said above, you can use Optifine's Custom Entity Models (CEM) feature to basically remodel the entity you want, changing the angle of whichever body parts you choose. You might also be able to use the animation feature to just change how it holds its arms, though I'm not sure as I haven't delved too deeply into this feature.
So no, it's not pure vanilla Minecraft but is still a thing you can do with a resource pack... albeit mod-assisted.
i am wondering if its possible to make a mob with their arms beside their sides or is that not a possiblity.
Do you mean like with a resource pack? If so, then no, because models are hard coded.
Uncrafting Table (1.15.2): https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/wip-mods/3032965-uncrafting-table
Ruins of Humanity (mod, no longer being developed): https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/wip-mods/2898701-1-12-2-wip-early-alpha-ruins-of-humanity
It is possible using a modification like Optifine, but outright saying is impossible (implying not even with a modification) is just wrong.
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Retired StaffTo give more context to what KittenKatja said above, you can use Optifine's Custom Entity Models (CEM) feature to basically remodel the entity you want, changing the angle of whichever body parts you choose. You might also be able to use the animation feature to just change how it holds its arms, though I'm not sure as I haven't delved too deeply into this feature.
So no, it's not pure vanilla Minecraft but is still a thing you can do with a resource pack... albeit mod-assisted.
I hope that helps you.
Sorry my wording was a bit misleading. I meant that it's not possible with just a resource pack.
Uncrafting Table (1.15.2): https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/wip-mods/3032965-uncrafting-table
Ruins of Humanity (mod, no longer being developed): https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/wip-mods/2898701-1-12-2-wip-early-alpha-ruins-of-humanity