Fins to Feet

This spell transforms tails, tentacles, or finned extremities into humanoid legs and feet.

(Stormwrack)  
Originally posted on D&D tools

Transmutation

Level: Druid 2, Sorcerer, Wizard 2, Seafolk 2,
Components: V, S,
Casting Time: 1 standard action
Range: Touch
Target: Willing creature touched
Duration: 1 hour/level
Saving Throw: Fortitude negates (harmless)
Spell Resistance: Yes (harmless)

Creatures so affected lose any natural swim speed they possess but gain a land speed instead.

Transmuted Medium creatures have a base land speed of 30 feet, Small and smaller creatures have a base land speed of 20 feet, and Large or larger creatures have a base land speed of 40 feet.

The creature loses any natural attacks based on its tail or tentacles.