Yes. First URL describes one that grows in trees!
The second URL describes an interesting effort to use cactus as a water and food source in Kenya. Among other things, one species of Opuntia can be used for water purification. Good deal! It mentions spiny and spineless varieties of cactus growing wild in Kenya.
“thorns” are modified branches and “spines ” are modified leaves . Cacti have spines.
Ground level: Genus Ariocarpus (8 species) have spines when they are young but mature are spineless!
Tree level: Genuses Phipsalis and Schlumbergera have spines while young, but not as adults.
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