Is is possible that Cretaceous fish, notosuchians, lepidosaurs, or other vertebrates have a morphology that might be confused with "spoon-shaped" sauropod teeth?
I have seen a fossil isolated tooth (from a mesozoic strat unit) resembling those "spoon shaped" elements of sauropods. If that is the case, it is a "narrow spoon" more similar to brachiosaurid teeth than a "broad spoon" typical of more basal sauropods. In any case, the tooth is too small compared to those of adult sauropods. If it represents a sauropod, then it comes from a juvenile individual, but it might as well be something else.
I second that, if you had a picture of that tooth it would be very helpful. Isolated teeth can be pretty deceiving, there is a load of convergence going around. If you really had a brachiosaurid tooth from Colombia it would be exceedingly interesting, so may be you can upload some pictures in the new year.