Select an object. > Modify panel > Modifier List > Object–Space Modifiers > Spherify
Select an object. > Modifiers menu > Parametric Deformers > Spherify
Tab panels > Modifiers tab > Spherify Modifier
The Spherify modifier distorts an object into a spherical shape. This modifier has only one parameter: a Percent spinner that deforms the object, as much as possible, into a spherical shape.

Spherify shapes the dog inside the snake.
The success of the operation depends on the topology of the geometry to which it's applied. For example, a cylinder with no height segments will result in little change. Adding height segments will result in a barrel at 100 percent. Adding cap segments will produce a sphere.
Try this on a teapot.
Example: To animate spherifying a teapot:
Click Create >Geometry > Standard Primitives > Teapot.
Create a teapot in the viewports.
On the Modify panel, choose Spherify from the Modifier List.
Turn the Auto Key button on.
Set the Spherify Percent to 0.
Move the time slider ahead to frame 30.
Set the Spherify Percent to 100.
Turn the Auto Key button off.
Drag the time slider to play the animation, or press Play.
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