Makara
Makara is the legendary aquatic hybrid of Hindu/Buddhist myth — crocodile forequarters, elephant trunk, fish tail, peacock feathers. Mount (vahana) of Ganga and Varuna; guardian of temple thresholds (torana). Appears from 2nd c. BCE (Besnagar pillar) across South/Southeast Asia. Zodiac sign Capricorn. Not specifically 'Bangladeshi' — pan-South Asian.