phyllopode
/ˌfɪləˈpɔːdi/ or /ˌfɪləˈpɒdi/Definitions
1. noun
A type of aquatic salamander or a larval stage of certain aquatic amphibians, characterized by a fish-like appearance and the ability to breathe through gills.
“The phyllopode stage of the axolotl’s life cycle is quite fascinating.”