• Fire wolf = Faiwuf
  Fai = Faiya (Japanese people when they say "fire"),
  Wuf = Wurufu (Japanese people when they say "Wolf")

• Grass Racoons = Gurazoo / Goorazu / Kusagoon / Gozakun / Gozaku
  Gurazoo/Goorazu = Gurasu (Japanese people when they say "Grass / Glass") + "oo" from Racoon
  Kusagoon/Gozakun/Gozaku = Kusa ("grass" in Japanese), Kusago ("after the grass" in Japanese) + oon / kun from Racoon
  (I thought that this character would be suitable when making "Goo" sounds in a deep voice)

• Water Whale = Whaburu / Whaburu /Whaburu / Whable / Wabel
  It means Whale + Bubble (or Baburu In Japanese)

• Electric Rabbit = Uzapi

It Means "Usagi" ("Rabbit" in Japanese) + Zap

_{All the ideas come from Google Translate}