Frog can refer to several topics:

• A frog is a type of fresh-water amphibian.
• FROG, a block cipher
• A frog (fastening) in sewing is a sort of closure, often used in cloaks, made from a specially knotted cord forming a button of sorts, and a loop on the other side of the closure, forming an effective button hole .
• FROG stands for Frequency-Resolved Optical Gating , a method used to measure ultrashort optical pulses.

• In Australia the Freddo frog is a popular confectionery treat.
• The Frogs is a comedic play written by the Classical Greek author Aristophanes. A musical adapation by Stephen Sondheim and Burt Shevelove was first produced in the mid-1970s.
• The Frogs is a controversial rock music band .

• A frog is a flat metal base with closely-ranged spikes to hold flower stems in a flower arrangement.
• A frog is the end of the bow of a stringed instrument that includes the nut - the mechanism which alters the tautness of the hairs.
• "Frog" is a derogatory term referring to a French person.
• A frog, in railways, is the means of passing one running rail through another, with flangeway; most commonly found in switches but also diamond crossings and the ends of gauntlet track.
• A bullfighter's jacket is called a frog.
• a Frog is a folding bicycle produced by Riese und Müller
• FROG, an acronym for "Free Rocket Over Ground", is a type of (former Soviet Union) rocket artillery using large unguided solid-fuel missiles.