Could you get coolant in your oil pan from a leaking intake manifold gasket?

Sounds like the head gasket has gone bad and the coolant is leaking into the oil. Need to have a shop inspect.

Yes, the intake gaskets can because right below the intake is the crankcase!! Do not try to crank the engine, have it towed to a repair shop, antifreeze WILL destory the bearings, hope it has not done so already. Also possible cracked cylinder head on 2001 through 2006 5.3 GM.