Joachim Andersson’s review published on Letterboxd:
Classic ninjafare with the young son of a murdered lord trained as a ninja and tries to get revenge. Of course, his ninja powers include transforming into a giant firebreathing frog which makes it even better. No real flair here but a ton of fun even if you will be disappointed if you're here for the kaiju parts, they are mostly confined to the end but hey, did you miss the words "giant firebreathing frog"? It's all worth it. And there is a dragon and a spider too! And a bird.