Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
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Giant Toad Boss Guide
Compared to the other bosses William battles during his adventure, Giant Toad has a pretty simple attack pattern that makes it easy to telegraph what he is going to do next. He will make a dashing stab in your direction with his spear, then hop up to do a downward thrust.
This attack pattern allows you two chances to hit him: first, when he pauses for a second after the dashing stab, then again after he does the downward stab. You can use a spear in low stance, but using dual katana is another option because they deliver twice the damage for the same amount of time.
As always, keep away from the business end of his spear to keep damage to your HP to a minimum.