frog
蛙 centers on the animal frog. It is a straightforward creature name with no major abstract extensions.
蛙 combines 虫 (insect/creature) with 圭, which likely contributes the sound. The character has long been used for frogs.
The left side 虫 is a creature, and the right side 圭 looks like two stacked earth mounds. Picture a frog sitting on a mound of earth in a rice paddy.
For ア, imagine a frog letting out a loud 'ah!' croak: ah -> ア, and the frog's mouth opens wide.
frog
tree frog (esp. the Japanese tree frog, Hyla japonica)
American bullfrog (Lithobates catesbeianus)
African clawed frog (Xenopus laevis)
blue poison dart frog (Dendrobates azureus)
Schlegel's green tree frog (Rhacophorus schlegelii)
Holst's frog (Rana holsti)
person who is ignorant of the real world; frog in a well
the frog in the well knows nothing of the great ocean
frog in a well; someone with a narrow perspective
narrow perspective
a narrow-minded person cannot understand the ways of the world; a frog in the well cannot understand the ocean even if it is explained to it
banded bullfrog (Kaloula pulchra)
mission golden-eyed tree frog (Trachycephalus resinifictrix); Amazon milk frog; blue milk frog
wrinkled frog (Rana rugosa)
narrow-mouthed toad (Kaloula borealis)
Amami tip-nosed frog (Odorrana amamiensis)
Surinam toad (Pipa pipa); pipa
Australian green tree frog (Litoria caerulea); green tree frog; White's tree frog; dumpy tree frog
montane brown frog (Rana ornativentris); Nikkō frog