Well, he wouldn't swallow him. Remember in BG2 when Minsc still has Boo, and says it's because "Boo is so squirrelly and there is ever so much of Minsc to search" - I choose to believe this means he stuffed Boo inside his cheek and just didn't talk.
Well, that's an... optimistic look at it, I guess.
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(Updated 19.07.13) Games Joined: 53 Games Dead: 50 Games Successfully Finished: 0 Partially Finished/TPK'd: 1