Aww..your little Toby is precious!
My Yuki has been deaf from birth. He will be 10 years old this year and is the greatest joy! He’s very smart and responds to all my hand signals. The best resource I can recommend is “Deaf Dogs Rock”. It has a lot of good tips and information pertaining to deafness. The only other thing I can say is Frenchies can be stubborn and if they don’t do what you want it wouldn’t be because he’s deaf….it’s because he is a Frenchie. LOL. So training a Frenchie requires much love, patience and consistency whether he can hear or not.