The Giant Toad or “Ogama” is known in Japanese Folklore to be wielding a spear and breathing smoke. Many players may be familiar with them from the famous anime series “Naruto”. The strategy for this fight is to attack between his attacks. The boss does an attack about once every 5 seconds and they hit like a truck so you want to dodge them at all costs, run in and hit him, then back up and avoid his next attack. The idea is to be ready and waiting for about 1 second before he attacks so you have plenty of time to avoid it. In phase two he throws random bombs while doing his usual attacks. There is a bit of RNG involved here, so stick with it and don’t get frustrated if you die in this phase. .
As found on Youtube