You'll get red maple seedlings, but not 'Franksred'--it is clonally propagated, not a seed strain. If that doesn't matter, just look for information about growing maples from seed. Basically it will involve planting mature fruits in later summer or fall where they will be exposed to cold but not interfered with by birds or rodents, waiting for them to come up--same as with many other cold climate trees and shrubs. With maples in particular there is the added point that germination is said to be much more eager if the seeds are planted will still soft and greenish, rather than hard and tan or brown. (You do wait until they are up to size before picking and planting, of course).