Medigoron

Medigoron is Biggoron's younger brother of a size smaller than Biggoron but still larger than your average Goron.

=Ocarina of Time= In Ocarina of Time, claims to be as good as his brother as smithing, and asks Link to pay 200 Rupees in exchange for the Giant's Knife, a blade which turns out to be essentially useless as it breaks after using it 100 times.

=Majora's Mask=

He also appears in Majora's Mask, this time making the devastating Powder Keg. He is also the Goron that gives Link his Powder Keg Certification, a certificate proving he knows how to use the Powder Kegs.

=Trivia=
 * Medigoron's name seems to be a portmanteau of medi- (from the latin medius, meaning middle), and -goron (believed to originate from the phrase "goron, goron", a Japanese onomatopoeia for the sound of a rolling rock.)