Freljord What If?

So as I understand. the reworked Nunu gained the ability to make his imagination real, hence Willump was created by Nunu to be his companion. But, it seems like Nunu has insane power now... So does that mean he could beat DEMIGODS like , , and ? Not gameplay wise, but purely off of lore? For now I will focus on Volibear due to him being considered the most ferocious.