Sounds like you'll need the LMC555 for the frequency you want, to get the power you want you'll need some beefy transistors, the current output of the LMC555 isn't that great so it's probably not going to drive 10amp bipolar transistors directly, especially the sinking current is weak(only 10ma), so I'd suggest a pair of bipolar transistors (per Mosfet gate) that work at a higher voltage so you can use them to bootstrap the output of the LMC555 to a higher voltage that would feed the FET gates.
Even with an output voltage of 5 volts, you're going to have a HARD time finding a logic level FET that will be low ohmic at 5 volts gate drive with a 10amp source/drain current, so you'll really need some kind of Mosfet gate driver.
I don't have the time to draw up a schematic for that but the design is pretty simple and something you should be able to work.