Couldn't the Tollan have contacted the Asgard for help?

I'm pretty confident the Tollan knew of the Asgard by season 5. So I'm thinking about the episode 'Between Two Fires' (5x9) where Anubis was threatening the Tollan with destruction if they don't build weapons for them specifically to counter the Tau'ri iris defense.

Obviously the Goa'uld are watching the Tollan to a certain extent. But there is no way they could have been watching every one of them. So it shouldn't have been hard for them to send out a discreet message to contact the Asgard for help. Although Anubis has upgraded his Ha'taks, he would not risk an outright conflict with them. Especially against their newer ships the O'Neill class.

If not that, they could have discreetly told the Tau'ri who could have relayed the message to the Asgard.

It just seems so dumb how easily the Tollan government rolled over to the Goa'uld knowing their nature that they would forever be under their thumb unless they fought back in a meaningful way.