They certainly have clocks.
And of course they did none of these dreadful things, and everything was cleaned and put away safe as quick as lightning, while the hobbit was turning round and round in the middle of the kitchen trying to see what they were doing. Then they went back, and found Thorin with his feet on the fender smoking a pipe. He was blowing the most enormous smoke-rings, and wherever he told one to go, it went—up the chimney, or behind the clock on the mantelpiece, or under the table, or round and round the ceiling; but wherever it went it was not quick enough to escape Gandalf.
The Hobbit - J.R.R Tolkien
Bilbo took out the envelope, but just as he was about to set it by the clock, his hand jerked back, and the packet fell on the floor. Before he could pick it up, the wizard stooped and seized it and set it in its place. A spasm of anger passed swiftly over the hobbit’s face again. Suddenly it gave way to a look of relief and a laugh.
A Long-Expected Party- Fellowship of the Ring - J.R.R Tolkien
There does not appear to be specific reference to alarm clocks...perhaps Tolkien did not consider it necessary to be that detailed.
Thing is...they probably bought or imported the clocks they did have from traders / travellers.
Tolkien gives us information on hobbits..in the Concerning Hobbits preface.
They do not and did not understand or like machines more complicated than a forge-bellows, a water-mill, or a hand-loom, though they were skilful with tools.
[snip]...but they had long and skilful fingers and could make many other useful and comely things.
Thus it seems likely that they might have had the skill to make clocks, they did not have the knowledge or desire.