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My understanding is that Danish oil is often a blend of conditioner and varnish, and is intended to be used as a finish. Teak oil is just an oil conditioner, and can be used on bare woods and on woods that are finished with an oil base finish. So teak oil is probably the one you want.
Consequently, can you put lacquer over Danish oil?
In short; you CAN apply a lacquer or a polyurethane over a Danish oil. The key to success is to make sure the oil has fully dried first. This should make sense, because once dried, the oil has cured to a hard solid film surface, and stuff will now stick to it. The other general class of oils are Non Drying Oils.
Also know, can you use teak oil on Pine?
don't do it on pine. Most of the time it's just a combination of tung oil, boiled linseed oil, and some resin. teak wood is very resistant to weather/environmental related decay. if you put Minwax teak oil on your non treated/treated pine it will make it mold.
Watco is just a mixture of mostly boiled linseed oil with a small amount of varnish added. Then you can apply a couple of coats of an oil based poly varnish. This will be a more protective and durable finish than the Watco. I used Johnson's Paste Wax over the top of Watco Danish Oil on some keepsake boxes.