Is it forbidden to boil a living animal and then take its meat for consumption? Does the Torah or another source address the concept of boiling living animals?
Ignoring the kosher-aspect of boiling instead of slaughtering:
Boiling an animal alive could be against the prohibition of causing unnecessary pain to animals - what is colloquially called צער בעלי חיים - Tza'ar Ba'alei Chaim.
It's a long-standing dispute whether this is a Torah prohibition or a Rabbinical prohibition, but every agrees it's prohibited to cause unnecessary pain to animals.
Only where the pain is beneficial and useful to people, may one cause pain - like killing them to eat them or use their hides for some purpose, or stomping on them if they bother us - so now you have to decide if the added benefit of boiling them is sufficient to warrant the extra pain.