Assuming you need Nature Incarnate to be a kaiju, not much works with it. Giant's Lunge does, though you need Trick Magic Item and an 8k scroll to cast it, that gets you 40'. Otherwise, tentacular limbs is a GM call because of the morph trait.
Your morph effects might also end if you are polymorphed and the polymorph effect invalidates or overrides your morph effect. The GM determines which morph effects can be used together and which can't.
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