Since that hasn't been brought out as an option, it's not likely. Formulaicly, Fusions always completely wreck whomever they're fighting. That's why they're never allowed to win.
Frieza explicitly said he spent 10 years training in the chamber, but didn't say he was going back for more. Since he effortlessly beat Goku and Vegeta in their most powerful forms, he probably sees no reason to go back and train more.