This issue has been addressed ad nauseam... a simple search would have answered this Q's. but here it goes.
technically, you can, by doing something that is not legal. (your sig wouldn't stand in court, makes for a good soundbite though, and yes, tracfone is vindictive and has been known to sue).
1. there are no smartphones on VZW for ST, so your data consumption will light up like a bulb, and when ST gets the bill from VZW, they will be howling.
2. All the VZW dumbphones on St have proprietary Airtank software on the phone, this software communicates with the ST servers(unhackable for all practical purposes), and even if your service works for a short time, it will ultimately be caught and your number has a good likelihood of being blacklisted, and then you will lose your number, ST sometimes waits for you to refill service and then cancels service to inflict max damage.
3. Tracfone isn't your friendly US carrier, afraid of you raising a stink, or image issues. It has a bareknucles business strategy and is the worlds 3rd largest wireless company(ATT is in the 16th slot). They are big and when they feel cheated, they are known to come at you pretty strongly, PR be damned.
Bottomline: Possible, but you will be caught, search on the forums, one poster got a call from ST within a couple of hours after flashing. If you still plan to do this, you will have made an informed decision.