The Switch was their first big OEM sell I think
Other than that, I remember a few Samsung tablets with Tegra chips.
The Zune HD had the original Tegra APX2500. It was ok.
Tegra 2 was popular with phones at the time because it was one of the first dual core A9 ARM CPUs. But NVIDIA fucked it up by not hitting the original thermals and not including NEON to try to force people to use their propietary GPU based SIMD.
The Nexus 7 2012 had a Tegra 3, which had a shitty as fuck eMMC controller that degraded performance over time until the tablet was slower than time inside a black hole. Also, ran kinda hot. It was also used in the original Surface RT. Wasn't used at all in phones because Phone makes do not forgive nor forget when you can't hit the thermals you promised.
Everyone skipped the Tegra 4 because it was hot as fuck, but it was used in the Surface 2 (non-pro), and some did use it when they we able to get their thermals under control (AKA nvidia sold them for peanuts compared to Qualcomm's SoCs). Tegra 4i did get some use in some Tier 2 phones, but that was because NVIDIA was giving them away pretty much.
The Nexus 9 has a Tegra K1. It has been used in like, 4 tablets?
The X1 really has no OEM wins besides the Switch. Sure, it is used in the Pixel-C, but that is not exactly mass market.