I suppose this is the Blue Version of the Whelpling Pets. as far as I know there is no Blue Dragon Whelpling Pet in the game yet.
Dragon Whelplings Gainable:
Dark Whelpling (Black Dragonflight)
Tiny Crimson Whelpling (Red Dragonflight)
Tiny Emerald Whelpling (Green Dragonflight)
Dragon Whelplings Gainable:
Dark Whelpling (Black Dragonflight)
Tiny Crimson Whelpling (Red Dragonflight)
Tiny Emerald Whelpling (Green Dragonflight)