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The Adventures of Jimmy Crikey: The Emerald Lake by Wallace Briggs

This is a stand-alone, fourth in series, The Adventures of Jimmy Crikey, the alien orphan who, despite cruel bullying, decided to make his home on Earth. He numbers among his friends the four witch guardians of Earth’s realms and the ancient Lord Oron, aka The Weatherman.
The underground Emerald Lake, the home of the Aquamites, is invaded by a flesh-eating, fire-breathing serpent, which is impervious to the magic of the four guardian witches. Matilda, the chief witch, asks for Jimmy Crikey’s assistance.
Jimmy accompanies Elwinn, witch guardian of everything associated with water, to visit the Emerald Lake. They arrive at a plausible plan to capture the serpents in a spider’s web net.
Their strategy is complicated because Jimmy cannot breathe underwater unless he is included in Elwinn’s bubble. Several of the strongest young Aquamites agree to act as live bait to entice the serpents into a lake inside an extinct volcano’s caldera.
Once the serpents are lured into the volcano’s lake Jimmy, with the help of his starship SR3 and XRU, the intelligent computer/navigator, will trap the reptiles in a spider’s web net, ready to drag the creatures into the cold depths of deep space.
Jimmy’s heart is captured at first sight of Annison, a young, golden-headed Aquamite who is also the daughter of Milton, the leader of the tribe.
During the operation to rid the Aquamite’s world of serpents, Annison is seriously injured when one serpent takes a bite out of her lower tail. She is dying from the loss of blood. The witches do not have the power to help. There is no time to get her to Jimmy’s home plane of Attalia for advanced surgery.
All appears lost until Lord Oron reveals his real identity. Lord Oron is one of the twelve Lords who serve the all-powerful Master. The Master could save Annison, but he refuses to bring a subject back to life from the dead. Can Lord Oron persuade the Master to intervene and save the life of Jimmy’s first love, Annison?