Starvation would be an issue only until the first harvest comes. Just need to create lots of new farm fields for crops. Hunting and harvesting wild plants are important for the first year
Most people in Vermont, both tourists and residents, aren't farmers and don't know how to farm. It is not so easy to learn farming skills. Also it'd take time just to clear out all of the 1754 forest that is now present in farmland from 2016, forget about the additional farmland. Vermont cannot be self-sufficient for food for a while. They can mitigate the worst effects through hunting and gathering, but with one and a half million people they'd quickly start running out of things to hunt unless they start hunting on other people's lands.
Vermont needs to establish trade, diplomacy and co-owned farm fields with neighboring tribes. There are Uptime Natives in Vermont so that helps with the language
There would be a population boom in Vermont and nearby Indian tribes as the economy would be booming and Natives get modern healthcare. Tribal warfare becomes nonexistent as Vermont enforces peace and later establishes an Confederation like the Iroqious
Neighbouring tribes already have their own European protectors they are quite loyal to. Haudenosaunee loyalty to the British could be shaken by sharing future information about how Britain ultimately abandons them, but I doubt there is anything that could be done to dissuade the Abenaki alliance with France. About the 2016 Abenaki in Vermont, there is very little knowledge of the Abenaki language among them and the 21st century pronunciation by 2nd language speakers of Abenaki based on a dialect that wasn't originally spoken in Vermont might not be intelligible to the 1754 Abenaki in Vermont. It is more likely that communication is carried out in French.
There is no population or economic boom in Vermont. The loss of the existence of the 21st century and absence of the many conveniences of 21st century life that are not made in Vermont itself and cannot be reproduced due to lack of resources or expertise means that Vermont's GDP would contract by more than 2/3rds. People are depressed about losing contact with their friends and families, their jobs being useless in the new situation, about starving, etc. Instead of making lots of babies, people will be killing themselves out of desperation and in hopes that it eases the food situation for others. Additionally, there is a new shortage of medications that used to be shipped in to Vermont, including medications that save people's lives. Vermont has no interest in being an imperial power that protects the indigenous people; the government is very much focused inwards (especially due to the hardships being faced, but also because Vermont already has very anti-interventionist politics). They could mediate between tribes and perhaps sell weapons so that tribes can defend themselves better, but ultimately Vermont is uninterested in intervening in the tribes' wars.
Vermont eventually assimilates all of the Americas which is a much better fate for the Natives
I fail to see how Vermont is in a situation to do this, why it would want to do it or why this is better than providing aid but respecting indigenous culture and identity.
Even in the situation where Vermont is no longer suffering so badly, it still has a dramatically shrunken economy and a lack of needed resources to restore 21st century lifestyle. It has to deal with the hostility that will no doubt develop over modern mores about sexuality, human rights, fashion, religion etc. It will have to deal with there being an ongoing regional war that could possibly, as it did OTL, escalate into a global conflict. This isn't a feel good "modern man always wins" timeline. It is a serious exploration of what would happen if you took 2016 Vermont, a state that depends on a global logistical network for a highly comfortable standard of living, and removed it from all of its external support structures. The result will not be pretty, even though Vermont is still more powerful than all of its neighbours.