Final answer:
The participle or participial phrase in the sentence is 'getting its name from the frothy water cascading down its steep cliffs'.
Step-by-step explanation:
The participle or participial phrase in the given sentence is getting its name from the frothy water cascading down its steep cliffs. This phrase modifies the subject 'Buttermilk Falls State Park' and provides additional information about how the park gets its name. Participles are verb forms that function as adjectives, and in this sentence, the present participle 'getting' is used.
Learn more about Participles in English