Yes. Sea animals are lawful even when found dead, because the Quran permits the game of the sea and its food (5:96). Scholars also permit locusts, based on the hadith that two kinds of dead animals are lawful: fish and locusts.
Deniz avı ve onu yemek size de, yolculara da, geçimlik olarak helal kılınmıştır. İhramlı bulunduğunuz sürece kara avı size haram kılınmıştır. Huzuruna toplanacağınız Allah'tan sakının.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Can I eat fish that died by itself?
Yes. Sea animals are lawful even when found dead, because the Quran permits the game of the sea and its food (5:96). Scholars also permit locusts, based on the hadith that two kinds of dead animals are lawful: fish and locusts.