I love Mo’s voice, I can scruslly mimic it and say “Littlefooot” and “Mooo!” 
When I first saw that last word, I accidentally read "moo."
Boy, though, that's impressive! I'd love to hear somebody do a Mo imitation, because I couldn't pull that off if my life depended on it.
I agree that Rob Paulsen did a great job on Mo--and on all the rest of his LBT characters, too, really. When I was little, I had never imagined Spike, Mo, Strut, Rinkus, and Guido would end up being the same person!
Mimicing or imitatimg is a hobby of mine, I can do Mo, Lord Vader, Darth Malgus, Emperor Palpatine, Yoda, The Witchking (Lord of the Rings), Gollum, Metal Sonic, Young Link (Legend of Zelda), Yoshi (Super Mario Bros), Velociraptor (Jurassic Park and Jurassic Park III), T-Rex (Jurassic Park), Spinosaurus (Jurassix Park III) and more.