Frigidaire frs26znh freezer making loud noise

Maybe the ice maker?

You need someone to check the fans and where the noise is coming from before the repair cost you a lot of money because of damage it can cause. The fan may be hitting ice in the freezer or out of balance because it is worn out. No one can hear what you hear and someone will need to be there to check these things out, Sea Breeze

evaporator is probably frozen up

Change starting components.

your power contactor relay on the compressor body is defective

Locate what is making the noise. There is a fan in the freezer behind the rear cover inside. There is a fan underneath accessed from the rear behind the cardboard backing. The compressor is also there with a starter/overload relay which could make the noise.

the loud buzzing is the freezer high temp alarm. dont know why its warm though.
make sure you don't store anything on top of or on the sides of the unit as the condenser of most freezers are buried in the walls of the unit and it will over heat the compressor. if unit is in a hot garage this will compound the problem.

Check the coils in the freezer to see if they are blocked with ice.

Since I could get no one to tell me about new freezer compressor making buzzing noise while on, I had the store come a pick it up and give me my money back.

at 6 years old it certainly aint new!
from what you describe, sounds like a compressor fault