This would fit easily as a “large mammal” mob in Minecraft. Since most large mammals like elephants are endangered and have “problematic” drops like ivory, a solution could be to add already extinct large mammals that aren’t at risk, such as the Glyptodon.
Minecraft is in need of large mammal mobs, especially the Savanna, and glyptodons would be a really cool way to fill that role. They were car-sized relatives of the armadillo that grazed on ice age savanna grasses. They had a hard shell of scutes. To give the mob some combat options, Glyptodons in Minecraft could be based off of the Doedicurus, which had a spikey club-like tail.
Glyptodons as such would be peaceful or neutral mobs that spawn uncommonly in herds in the Savanna biome. They’d have high defense due to their shell, but their hairy underside could be a weak point. They could maybe drop their shell as a block or maybe their scutes. Maybe they could be ridden as well?