No, but they are a good back-scratcher.
Many types of cactus are edible and commonly eaten by people. Prickly pear cactus is one example.
PRICKLY pear cactus
Yes, prickly pear fruits develop on a number of cactus plants and are edible.
The Prickly Pear Cactus
In the deserts of the American Southwest, seed pods from the mesquite tree/bush are edible as well as the fruits and tender new pads of the prickly pear cactus.
cacti bear edible fruit such as the prickly pear and hylocereus which produces dragon fruit or pitaya.
Cacti are producers! Producers are plants and plants do not 'eat' other plants.
on a pear
A prickly pear is a cactus. There is no commensalism or mutualism.
The fruit of the cactus is commonly known as a prickly pear or cactus pear. It is a sweet and flavorful fruit that grows on certain species of cacti.
The pads and fruit of the prickly pear cactus are edible. The fruit can be peeled and eaten raw. However, many experts suggest that the fruit is best when it is made into candy, jelly, juice, or wine. It is also available dried or in extract form.
Pear Cactus is used to help with diabetes, but no studies prove that Pear Cactus will cure diabetes.