Immature swimmer
Else clues• Creature that loses its tail
• Frog larva
• Frog of the future
• Frog-to-be
• Future frog
• Future jumper
• He'll croak eventually
• He's a little froggy
• Infant amphibian
• Kermit as a kid
• Kermit as a youngster, presumably
• Kermit as a youth
• Kermit, once?
• Larval amphibian
• Lily-pond larva
• One who'll croak in the future
• Polliwog
• Pond denizen
• Pond infant
• Pond swimmer
• Small frog in a big pond?
• Young Kermit to plead insane (7)
• A larval frog or toad