I don't think people who are already permanent residents can get a nonimmigrant visa or otherwise change into nonimmigrant status without first abandoning permanent residency (by filing I-407 at a US consulate abroad, which requires you to declare you have no intention of residing in the us). This is because all nonimmigrant statuses are intended to be temporary, and this is not consistent with permanent residency, which requires the person to maintain residence in the US. (There might be an exception where a B2 visitor visa can be issued to a permanent resident for an emergency temporary visit, but I don't think this applies to longer-term statuses like L status.)
Note that it is allowed for a permanent resident to be petitioned again and get another immigrant visa and "re-immigrate" through the new petition. So presumably you could try to go through the same process that you used to immigrate the first time (or immigrate through some other route), and your now spouse and children would be able to be derivative beneficiaries. However, depending on the category there may be waiting times involved, or if you immigrated through your employer, your employer may not want to go through the trouble of getting you to immigrate when you have already immigrated.