Kuroi kaeru
You may say 'kaeru,' written: カエル
That is hard to say, however frogs are generally appealed as "cute" in Japanese anime (just look at Japanese keychains) so that is probably why.
Only in the Japanese version of the movies.
Kero,
at the pond
かえる の おうさま(kaeru no ousama) is "frog prince" in Japanese.
Yes they take out the heart when the frog is still alive.
Kaeru.
Only in the Japanese version of the movies.
darte frog
What did Mike say, jokingly, that Ruth could do with the frog