Tonkor, and syndicate simulor/boltace were all nerfed in some way about 2 months ago. Apparently they ruined player experience, but the Limbo changes they introduced at the same time (e.g. disable primary/secondary and all skills of friendly players) were 'fine'.
Tonkor with friendly fire would be the best thing in WF. It has self-damage now (that's what you probably meant).
Actually, it barely has self-damage. It's simply insta-gib now if you hit yourself (and I don't even have a riven for it)
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Frost is good, it's one of my few goto frames for lazy mode sorties (defense and mobile defense, sometimes interception).