Cuz his animagus was a rat and a rats tail looks like a worm.
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Ron's rat was named Scabbers, but was really Peter Pettigrew, aka Wormtail.
Moony is Remus Lupin- who is a werewolf Wormtail is Peter Pettigrew- who is a mouse Padfoot is Sirius Black- who is a black dog Prongs is James Potter- who is a stag
Scabbers was the rat. Peter Pettigrew is the name of the person who was the rat.
Technically, Lord Voldemort. Voldemort gave Pettigrew a silver hand as a replacement for the one Pettigrew sacrificed in order to resurrect Voldemort. In the seventh book Pettigrew shows a moment of reluctance to kill Harry, and as punishment the silver hand turns and chokes Wormtail to death.
The four friends (nicknamed "the Marauders") made the Marauders map, and were as follows:Remus Lupin (Moony)Peter Pettigrew (Wormtail)Sirius Black (Padfoot)James Potter (Prongs)