Short answer
No, a whole jicama is far too much. Jicama is safe for dogs in small, peeled pieces, but a large amount can cause stomach upset or diarrhea from the fiber. Offer only a few small cubes as an occasional treat, and if your dog eats too much, watch for digestive issues and call your own vet if anything seems off.
Jicama — Food safety facts
Safe to share · Dogs · full breakdown on the linked food page
Peeled, raw or cooked, in small pieces. The skin and seeds are not edible.
The full verdict, portion guidance and serving notes are collected on the Jicama food facts page.