#hydroloth

On the left is the Dolphin Delighter, as in it is a magical talking fey "dolphin" that delights others. It likes to telepathically sing sea shanties and cause dazzling bursts of healing light. It also can teleport as it leaps, and is around 5-6 ft (1.5-1.8 m) long. As @valvadis pointed out, it seems likely that it's based on the Boto Cor De Rosa of Brazilian folklore. Shapeshifters that show up to parties, play music/dance/drink/fuck, and disappear into the night. Which does fit with the the "Fey" designation of the D&D version.

On the left, Hydroloth are 10 ft (3 m) tall frog fiends from the River Styx. They can turn invisible, cause madness, walk on water, cause magical fear, and are telepathic! They're also pretty chill, and are known for thier trading skills! Thier horrible trading skills, they're great at finding things but not at knowing thier value, so they often get scammed. They spend most of thier time trading, fighting, and just swimming around enjoying life.

Hyrdoloth are 10 ft (3 m) tall frog fiends from the River Styx. They can turn invisible, cause madness, walk on water, cause magical fear, and are telepathic! They're also pretty chill, and are known for thier trading skills! Thier horrible trading skills, they're great at finding things but not at knowing thier value, so they often get scammed. They spend most of thier time trading, fighting, and just swimming around enjoying life.