Tricycles use the same pedals as any other bicycle, so you should be able to pick up replacements from pretty much any bicycle store.
Keep in mind though that there are two fairly common axle threads for pedals, so your safest bet is to bring one of the old pedals with you when you go to buy new ones.
Pedals can be stuck on really hard, so remember that the left pedal unscrews clockwise.
The right pedal unscrews counter-clockwise, like normal.
Tricycle?
Assuming this is a serious question, a tricycle is a three wheeled vehicle that is operated by using pedals.
Depends on what parts you're looking for. Pedals, chains, tubes, tires handlebars etc are stock items which you can pick up at any bicycle store.
Murray tricycle tire
The very first "tricycle" was made in 1655 by a disabled German man who wanted to maintain his mobility. It was powered by hand cranks. The first tricycle to be powered by pedals was made in 1789 by two French inventors.
One can buy Hardwire pedals from the Hardwire Pedals website. Some other popular websites where can one can purchase Hardwire pedals are eBay, Amazon, Premier Guitar and many more.
Yes, you can buy brake pedals, but you have to make sure that they are the right ones for your car, and will works for your car. And always buy them from a trusted seller.
You are too small to ride, buy a tricycle
They discontinued making them so your best bet is eBay.
Bike pedals with reflective strips can be bought from Amazon's online shop. They offer multiple brands in multiple colors, as well as professional mountain bike pedals.
Nearly all his life he was a dedicated cyclist, most often using a tricycle.
the tricycle is a three wheeled bike