During Calf raises the calf muscles (Gastrocnemius and soleus) actively contracting i.e concentrically to shorten and eccentrically to lengthen to create the motion at the ankle. That's means the most of the work is done by the calf muscles and the tendon's is just really to transit the force by contrast.

during the Pogo hops the calf muscles almost works isometrically. Meaning that holds really tight and contract hard but they are not lengthening and shortening. We get most of the lengthening and shortening that's occurring a Pogo hops from the Achilles tendon and storing and releasing energy.