Does the marvel Thor die

Well, Thor is a Norse god, not a Greek one. At 'Ragnarok', the destruction of the gods, Thor struggles with the big snake and they both die.

Thor confronted the Midgard Serpent on the sea shore in the preamble to Ragnarok. He struck the monster five times in the head before it died. Then Thor took nine steps backwards and fell down dead from the serpents poisonous breath.