While many spin-offs have survived for many episodes and seasons, a lot more are short-lived and barley get any episodes, if any. Here is a list of all the Short-Lived Spin-Offs on SBC.
NOTE: If I made any mistakes on this, please feel free to edit this list. Thank you.
1. Squidtastic Hero
2. crimes and nematoads(nematoads fight crimes) (Joke spin-off)
4. the adventures of nematoads kids (Joke spin-off)
6. War of the Hicks (Project abandoned)
7. SpongeBob: The Legendary Frycook
8. Something's Missing
9. Saving his Soul
10. Krabby Land
11. Searching For Sandy
12. The Life of Gary
13. Patrick Seastar
14. Mr. Krabs and The Pirates
15. From The Abyss
16. Krabs' Kitchen
17. Spongebob's middle school years
18. To The Maxx!(episode area)
19. Essentric Electrical Eelz
20. Super Spy Sponge
22. SpongeBob: IN SPACE!
23. The Adventures of Mermaid Man and Barnacle Boy
24. Les Indices
25. Spongebob: Elementry Days
27. Number One Mysteries
28. Spongepool: Sponge with a Mouth
29. Super Sponge Bros!
30. The Squirrely Adventures of Sandy Cheeks
31. Alantis Futureplantis
33. Dayman!: Champion of the Sun
37. Golden Pearl
38. The life of a fish
40. Nightmare of Conch Street
41. Spongebob, The Doctor-Lawyer
43. Sponge's Alantis
45. The Naturally Normal Show
46. Plankton and Krabs: High School Rivary
48. The Brave Kaiser beings... Underwater.