Lion truthin

Here's a little mind game I play sometimes when I'm having trouble falling asleep.  Rather than explaining the rules, I'll just give you some examples.  (Maybe you already got it from the title.)  I think you'll pick up on the pattern.  My kids love this too.  Ok, so here goes:

lion - truthin

badger - goodger

panther - potther

hyena - lowena

donkey - donlock

tick - tock

goat - stopt

Get the idea?  Feel free to add one (or more) of you own?