Animals that can live both on land and in water are known as

Animals that can live both on land and in water are known as: Amphibians.

Amphibian (noun)
Bangla Meaning: জলে ও স্থলে বাস করতে সক্ষম প্রাণী; উভচর প্রাণী, যথা ব্যাঙ।
English Meaning: an amphibious organism, an animal that is a member of the class Amphibia (= animals that live both on land and in water.)

Other options:
ক) Cannibal (noun)
Bangla Meaning: নরখাদক; রাক্ষস; যে পশু স্বজাতীয়ের মাংস ভক্ষণ করে; স্বজাতিখাদক।
English Meaning: one that eats the flesh of its own kind.

গ) Herbivore (noun)
Bangla Meaning: তৃণভোজী প্রাণী।
English Meaning: a herbivorous (feeding on plants) animal.

ঘ) Omnivore (noun)
Bangla Meaning: সর্বভূক।
English Meaning: one that is omnivorous ( feeding on both animal and vegetable substances).

Source: Merriam-Webster Dictionary, Accessible Dictionary, Cambridge Dictionary.