NetHack should contain something that turns you specifically into a newt.

Addendum to the brewing patch: you can ferment/dissolve newt corpses to produce potions of gain energy, and can combine various fruits with water to produce fruit juice. Also, since booze tastes like liquid fire, fermenting a red mold corpse produces a potion of booze.

F corpses can be dipped into potions to make different potions: juice + violet fungus = booze, juice + yellow mold = sickness, water + green mold = acid. (Note the existence of the Brewing Patch, which dissolves most F in juice to produce confusion, hallucination, booze, sleeping, and healing.)

Later suggested recipes which involve dipping a corpse in acid to dissolve it:

• Wraith corpse → potion of gain level. (Does not always succeed, to compensate for the fact that a wraith corpse doesn’t always grant a level. Maybe it even has a lower success rate than getting a level from a corpse.)
• Newt corpse → potion of gain energy.
• Floating eye corpse → potion of levitation or possibly monster detection.