Immature toad or frog (7)
I believe the answer is:
tadpole
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">immature toad</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">frog</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Potential frog' mean 'tadpole' so perhaps 'frog' could also mean 'tadpole')</span><br/ ><br/ ></span>
(Other definitions for tadpole that I've seen before include "wriggler?" , "Frog in formation" , "Pre-frog form" , "Aquatic larva of toads and frogs" , "being hatched in a puddle?" .)