Do you begin with 10$ in solo game too?
It seems like you would.
The solo rules say that you follow "all the rules of the game," and those state that "Each player takes six penguins (purple), and $10 (one red $5 and five yellow $1s)."
I expect that you're asking because it seems likely that players start with $10 (instead of $0) that they will have money to pay other players who roll squirrels.
In the solo game, squirrels get you money from the bank (and not another player), so that reason for starting with money isn't there.
But I think that the rules would have said explicitly that you start with money if that were the case.