From the Super Mario Wiki
Kerokero Cola (also spelled KerokeroCola or Kero Kero Cola) is one of the most valuable (and expensive) items found in Super Mario RPG: Legend of the Seven Stars. Kerokero Cola can recover the HP and FP of everyone in Mario's party. It can be purchased at Tadpole Pond after acquiring the Soprano Card or in Marrymore via room service in the honeymoon suite. Kerokero Cola comes in a green cup with a picture of a green frog's foot or in a frog-shaped bottle. Kerokero Cola's name comes from kero, the Japanese onomatopoeia for a frog's noise.
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