What Templeton current by-law states regarding town budget:

§ 28-7

Preparation by Administrator and Board.

[Amended 5-19-2014; 11-20-2019 STM by Art. 7]

It shall be duty of the Town Administrator, in conjunction with the Board of Selectmen (Board), to consider expenditures and develop a budget for the ensuing fiscal year of the several boards, officers and committees of the Town, as prepared by them in such form and detail as prescribed by the Town Administrator, and further to present and defend the same throughout the review process and to the Town Meeting for action.

What Massachusetts state law shows - MGL chapter39, s16:

Section 16. Every town whose valuation for the purpose of apportioning the state tax exceeds one million dollars shall, and any other town may, by by-law provide for the election or the appointment and duties of appropriation, advisory or finance committees, who shall consider any or all municipal questions for the purpose of making reports or recommendations to the town; and such by-laws may provide that committees so appointed or elected may continue in office for terms not exceeding three years from the date of appointment or election.

In every town having a committee appointed under authority of this section, such committee, or the selectmen if authorized by a by-law of the town, and, in any town not having such a committee, the selectmen, shall submit a budget at the annual town meeting.

Templeton has a by-law informing those concerned who prepares and present town budget, accept it or work to change it, just don't spend time bitching about it or you may appear to be complaining just to be complaining.