Can I get a switch that incorporates 2 dimmers and a manual switch to control a kitchen fan?
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Assuming you mean a single gang switch, not a electrical wiring question, yes. From the big box stores in the US at least (Like Lowes and Home Depot) they stock a single gang piece with any combination of up to 4 switches.
The picture shows an example of one at Lowes, make sure to ask someone or read the box because they also sell models that have a dimmer/switch that runs a single line/appliance; for instance, the image I supplied is actually for running 2 fans.
(Picture source: Lowe's stock image of Pass & Seymour/Legrand 300-Watt White 3-Speed Slide Combination Ceiling Fan and Light Control)
Not in a single package unless you go to controller based system like X-10 or Z-wave.
I've seen dual dimmers or a dimmer + switch.