Preheat oven to 425°F and place rimmed baking sheet in oven as it heats.
In large bowl, toss carrots, parsnips, and celery root with grapeseed or avocado oil and season with salt and pepper, if desired. Spread out on hot baking sheet and roast until vegetables are golden and tender, about 30 minutes, stirring once halfway.
Meanwhile, in large saucepan, bring 3 inches of water to a simmer (the point when you see bubbles coming up to the surface, without full rolling bubbles). Into small bowl, crack an egg, then gently ease egg into simmering water. Repeat with remaining eggs, waiting until white of egg in water is opaque before adding the next egg (about 30 seconds apart). Poach until whites are set but yolks are still runny, about 3 minutes. Using slotted spoon, transfer eggs to paper towels as they are done.
In small bowl, whisk together olive oil, cider vinegar, mustard, garlic, and salt.
In large bowl, toss frisee or salad greens and roasted vegetables with dressing. Divide salad among 4 plates and top each with a poached egg. Sprinkle with chopped almonds.