Using
this calc from DontTalk as reference, using something like 10 meters as low ball for the giant height and the average density of rock (since on a closer look the thing seem more like rock than dirt):
(10/1.67)^3*73.46 liters= 15772.535391048731895454671352193m^3
The density of rock go from
1600 kg/m3 to 3500 kg/m3 so the average would be 2550kg/m3, so
15772.535391048731895454671352193 * 2550 = 40219965.247174266333409411948093kg
GPE= 0.5*mgh = 0.5 * 40219965.247174266333409411948093 * 9.81 * 10 = 1972789295.373897763653731656054 or 1.972789295e9 Joules Building level, plus the tree horns that add
And since the thing have show to be able to run and stuff like that it would be able to use KE which give higher results.