Use Blenders cast modifier to blend between shapes.
Blender Docs
https://docs.blender.org/manual/en/la...
The Cast modifier shifts the shape of a mesh, curve, surface or lattice, towards any of a few predefined shapes (sphere, cylinder, cuboid).
It is equivalent to the To Sphere tool in Edit Mode, and what other programs call “Spherify” or “Spherize”, but, as written above, it is not limited to casting to a sphere.
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