Blender mesh to roblox-animation, how do I turn "only" the head to face a player character?

WHERE I AM AT…

I have a blender mesh of a frog; I would like the frog to track a player by moving the head part of the mesh. The mesh is currently a single mesh part animated within blender…the file is exported to Roblox as fbx and the animations uploaded from it. The animations made in blender are generic… like blinking, hopping… etc… idle animations… They run perfectly!

THE PROBLEM…

I cannot figure out a way to animate the mesh in real time. For example, here I want to turn “only” the frogs head towards a player character. If the player moves, I want the head to track him. I may also want to animate his posture. I cannot figure out how to link the two together in real time.

MY GUESS…

Maybe I can add some sort of controller to the frog mesh after it has been imported into Roblox Studio? Maybe I can then write code to the controller and move its orientation? If so…, can I still control how the mesh deforms when turning? Any help is most appreciated! I just can’t puzzle this out because the research data I find is not specific enough for my needs.

What if I wanted the frog to lift up his foot and step directly onto a moving character in order to pin him down? How to do this with a single mesh model??