Oh hey wow. This a really ingenious idea. You pulled off the concept beautifully, especially with the meshed-together axolotl/walrus face; you've combined their features perfectly. You can still see both of the critters in the design, but it's creative enough that you've also created a whole new design instead of just cutting and pasting bits and pieces.
Iodine injections do not trigger metamorphosis in Walralotls. They are astral beings made of magic, sunshine, and chemical X. They are bringers of light and destroyers of worlds. More powerful than Cthulu, yet gentler than an obese cat; it is a wonder that they let our civilization thrive.