My own example:
"I will get me metamorphosed in this tough life and eventually make me a man of quick parts"
"a lot of entomologist think metamorphosing these moth would take so long time"
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I agree with Dan Henderson in his comment. So, I'll post this as a (community wiki) answer:
While it's not incorrect to use "metamorphose" as a verb, it's definitely far more frequently used as a noun: "entomologists think this moth's metamorphosis would take a long time". In the moth example especially, I read the verb form as indicating that the entomologists actually controlled and directed the moth's changes, rather than simply observing them.
(In other words, we use metamorphose much less often than its noun: metamorphosis.)
Also, as he noted in another comment:
It's not incorrect to use "metamorphose" as a verb
(= You would find it correct as a verb if you check the dictionary.)
[I]t's definitely far more frequently used as a noun
(= it can be used as a verb, but it is just not that common.)
And that answers your question.