The Hallowfall Gate & Candleslag Quarry, The Ringing Deeps
Initially, this magma snail cannot be interacted with or tamed due to it being ridden by a kobold: either a Kobold Trapper (Candleslag Quarry) or a Brightrock Shellvalier (inside the Hallowfall Gate mines). Once the kobold is dead the snail becomes a standalone NPC and can be tamed.
Level scaling: Most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.